SATO Masatoshi

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Name
SATO Masatoshi
Affiliation
Kyoto University

Research Interests

 
 

Academic & Professional Experience

 
 
   
 
Nagoya University
 

Published Papers

 
Multiple topological states in iron-based superconductors
Peng Zhang, Zhijun Wang, Xianxin Wu, Koichiro Yaji, Yukiaki Ishida, Yoshimitsu Kohama, Guangyang Dai, Yue Sun, Cedric Bareille, Kenta Kuroda, Takeshi Kondo, Kozo Okazaki, Koichi Kindo, Xiancheng Wang, Changqing Jin, Jiangping Hu, Ronny Thomale, Kazuki Sumida, Shilong Wu, Koji Miyamoto, Taichi Okuda, Hong Ding, G. D. Gu, Tsuyoshi Tamegai, Takuto Kawakami, Masatoshi Sato, Shik Shin
Nature Physics   15 41-47   Jan 2019   [Refereed]
Tatsushi Imaeda, Yuki Kawaguchi, Yukio Tanaka, Masatoshi Sato
Journal of the Physical Society of Japan   88 024402   Nov 2018
We investigate the instability due to dynamical axion field near the
topological phase transition of insulators. We first point out that the
amplitude of dynamical axion field is bounded for magnetic insulators in
general, which suppresses the axi...
Nobuyuki Okuma, Masatoshi Sato, Ken Shiozaki
Phys. Rev. B 99, 085127 (2019)      Oct 2018
We classify time-reversal breaking (class A) spinful topological crystalline
insulators with crystallographic non-magnetic (32 types) and magnetic (58
types) point groups. The classification includes all possible magnetic
topological crystalline i...
Ayami Hattori, Keiji Yada, Masaaki Araidai, Masatoshi Sato, Kenji Shiraishi, Yukio Tanaka
J. Phys.: Condens. Matter 31 (2019) 105302      Oct 2018
Using a multi-orbital tight-binding model, we have studied the edge states of
zigzag silicene, germanene, and stanene nanoribbons (ZSiNRs, ZGeNRs and ZSnNRs,
respectively) in the presence of the Coulomb interaction and a vertical
electric field. T...
Peng Zhang, Zhijun Wang, Xianxin Wu, Koichiro Yaji, Yukiaki Ishida, Yoshimitsu Kohama, Guangyang Dai, Yue Sun, Cedric Bareille, Kenta Kuroda, Takeshi Kondo, Kozo Okazaki, Koichi Kindo, Xiancheng Wang, Changqing Jin, Jiangping Hu, Ronny Thomale, Kazuki Sumida, Shilong Wu, Koji Miyamoto, Taichi Okuda, Hong Ding, G. D. Gu, Tsuyoshi Tamegai, Takuto Kawakami, Masatoshi Sato, Shik Shin
Nature Physics 15, 41 (2019)      Sep 2018
Topological insulators and semimetals as well as unconventional iron-based
superconductors have attracted major recent attention in condensed matter
physics. Previously, however, little overlap has been identified between these
two vibrant fields,...
Kobayashi Shingo, Sumita Shuntaro, Yanase Youichi, Sato Masatoshi
PHYSICAL REVIEW B   97(18)    May 2018   [Refereed]
Ikeda Atsutoshi, Fukumoto Toshiyuki, Oudah Mohamed, Hausmann Jan Niklas, Yonezawa Shingo, Kobayashi Shingo, Sato Masatoshi, Tassel Cedric, Takeiri Fumitaka, Takatsu Hiroshi, Kageyama Hiroshi, Maeno Yoshiteru
PHYSICA B-CONDENSED MATTER   536 752-756   May 2018   [Refereed]
Takuto Kawakami, Tetsuya Okamura, Shingo Kobayashi, Masatoshi Sato
Phys. Rev. X 8, 041026 (2018)      Feb 2018
We present a theory of the high-spin generalization of topological insulators
and their doped superconducting states. The higher-spin topological insulators
involve a pair of Tex bands with opposite parity, and are characterized by
their band ...
Igor Kuzmenko, Tetyana Kuzmenko, Yshai Avishai, Masatoshi Sato
Phys. Rev. B 98, 165139 (2018)      Jan 2018
In this work we study the possible occurrence of topological insulators for
2D fermions of high spin. They can be realized in cold fermion systems with
ground-state atomic spin Tex, if the optical potential is properly
designed, and s...
Sato Masatoshi, Ando Yoichi
REPORTS ON PROGRESS IN PHYSICS   80(7)    Jul 2017   [Refereed]
Shiozaki Ken, Sato Masatoshi, Gomi Kiyonori
PHYSICAL REVIEW B   95(23)    Jun 2017   [Refereed]
Hattori Ayami, Tanaya Sho, Yada Keiji, Araidai Masaaki, Sato Masatoshi, Hatsugai Yasuhiro, Shiraishi Kenji, Tanaka Yukio
JOURNAL OF PHYSICS-CONDENSED MATTER   29(11)    Mar 2017   [Refereed]
Xiong Yuansen, Yamakage Ai, Kobayashi Shingo, Sato Masatoshi, Tanaka Yukio
CRYSTALS   7(2)    Feb 2017   [Refereed]
Oudah Mohamed, Ikeda Atsutoshi, Hausmann Jan Niklas, Yonezawa Shingo, Fukumoto Toshiyuki, Kobayashi Shingo, Sato Masatoshi, Maeno Yoshiteru
NATURE COMMUNICATIONS   7    Dec 2016   [Refereed]
Kobayashi Shingo, Yanase Youichi, Sato Masatoshi
PHYSICAL REVIEW B   94(13)    Oct 2016   [Refereed]
Sato Masatoshi, Fujimoto Satoshi
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85(7)    Jul 2016   [Refereed]
Hashimoto Tatsuki, Kobayashi Shingo, Tanaka Yukio, Sato Masatoshi
PHYSICAL REVIEW B   94(1)    Jul 2016   [Refereed]
Taguchi Katsuhisa, Imaeda Tatsushi, Sato Masatoshi, Tanaka Yukio
PHYSICAL REVIEW B   93(20)    May 2016   [Refereed]
Shiozaki Ken, Sato Masatoshi, Gomi Kiyonori
PHYSICAL REVIEW B   93(19)    May 2016   [Refereed]
Mizushima Takeshi, Tsutsumi Yasumasa, Kawakami Takuto, Sato Masatoshi, Ichioka Masanori, Machida Kazushige
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85(2)    Mar 2016   [Refereed]
Kobayashi Shingo, Tanaka Yukio, Sato Masatoshi
PHYSICAL REVIEW B   92(21)    Dec 2015   [Refereed]
Hashimoto Tatsuki, Yada Keiji, Sato Masatoshi, Tanaka Yukio
PHYSICAL REVIEW B   92(17)    Nov 2015   [Refereed]
Kobayashi Shingo, Sato Masatoshi
PHYSICAL REVIEW LETTERS   115(18)    Oct 2015   [Refereed]
Amorim Cassio Sozinho, Ebihara Kazuto, Yamakage Ai, Tanaka Yukio, Sato Masatoshi
PHYSICAL REVIEW B   91(17)    May 2015   [Refereed]
Shiozaki Ken, Sato Masatoshi, Gomi Kiyonori
PHYSICAL REVIEW B   91(15)    Apr 2015   [Refereed]
Tsutsumi Yasumasa, Kawakami Takuto, Shiozaki Ken, Sato Masatoshi, Machida Kazushige
PHYSICAL REVIEW B   91(14)    Apr 2015   [Refereed]
Mizushima Takeshi, Tsutsumi Yasumasa, Sato Masatoshi, Machida Kazushige
JOURNAL OF PHYSICS-CONDENSED MATTER   27(11)    Mar 2015   [Refereed]
Lu Bo, Yada Keiji, Sato Masatoshi, Tanaka Yukio
PHYSICAL REVIEW LETTERS   114(9)    Mar 2015   [Refereed]
Mizushima Takeshi, Yamakage Ai, Sato Masatoshi, Tanaka Yukio
PHYSICAL REVIEW B   90(18)    Nov 2014   [Refereed]
Shiozaki Ken, Sato Masatoshi
PHYSICAL REVIEW B   90(16)    Oct 2014   [Refereed]
Hashimoto Tatsuki, Yada Keiji, Yamakage Ai, Sato Masatoshi, Tanaka Yukio
SUPERCONDUCTOR SCIENCE & TECHNOLOGY   27(10)    Oct 2014   [Refereed]
Koshino Mikito, Morimoto Takahiro, Sato Masatoshi
PHYSICAL REVIEW B   90(11)    Sep 2014   [Refereed]
Kobayashi Shingo, Shiozaki Ken, Tanaka Yukio, Sato Masatoshi
PHYSICAL REVIEW B   90(2)    Jul 2014   [Refereed]
Ozawa Hideyuki, Yamakage Ai, Sato Masatoshi, Tanaka Yukio
PHYSICAL REVIEW B   90(4)    Jul 2014   [Refereed]
Takami Shota, Yada Keiji, Yamakage Ai, Sato Masatoshi, Tanaka Yukio
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83(6)    Jun 2014   [Refereed]
Yamakage Ai, Sato Masatoshi
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   55 13-19   Jan 2014   [Refereed]
Sato Masatoshi, Yamakage Ai, Mizushima Takeshi
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   55 20-24   Jan 2014   [Refereed]
Tsutsumi Yasumasa, Ishikawa Masaki, Kawakami Takuto, Mizushima Takeshi, Sato Masatoshi, Ichioka Masanori, Machida Kazushige
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82(11)    Nov 2013   [Refereed]
Yamakage Ai, Yada Keiji, Sato Masatoshi, Tanaka Yukio
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   494 20-23   Nov 2013   [Refereed]
Yuji Ueno, Ai Yamakage, Yukio Tanaka, Masatoshi Sato
Phys. Rev. Lett. 111, 087002 (2013)   111(8) 1-87002   Aug 2013
Crystal point group symmetry is shown to protect Majorana fermions (MFs) in
spinfull superconductors (SCs). We elucidate the condition necessary to obtain
MFs protected by the point group symmetry. We argue that superconductivity in
Sr2RuO4 hosts ...
Takeshi Mizushima, Masatoshi Sato
New J. of Phys. 15, 075010 (2013)   15(July) 75010   Jul 2013
We theoretically investigate the effect of intertube tunneling in topological
superfluid phases of a quasi-one-dimensional Fermi gas with a Rashba-type
spin-orbit interaction. It is shown that the effective Hamiltonian is analogous
to that of a na...
Masatoshi Sato
Journal of Physics: Conference Series   391(1)    Mar 2013
Ai Yamakage, Masatoshi Sato, Keiji Yada, Satoshi Kashiwaya, Yukio Tanaka
Phys. Rev. B 87, 100510(R) (2013)   87(10) 1-100510   Mar 2013
We investigate the effect of helical Majorana fermions at the surface of
superconducting topological insulators (STI) on the Josephson current by
referring to possible pairing states of Cu-doped Bi2Se3. The surface state in
the present STI has a s...
Tatsuki Hashimoto, Keiji Yada, Ai Yamakage, Masatoshi Sato, Yukio Tanaka
J. Phys. Soc. Jpn. 82 (2013) 044704   82(4) 1-44704   Mar 2013
We study electronic properties of a superconducting topological insulator
whose parent material is a topological insulator. We calculate the temperature
dependence of the specific heat and spin susceptibility for four promising
superconducting pai...
Akihiro Ii, Ai Yamakage, Keiji Yada, Masatoshi Sato, Yukio Tanaka
Phys. Rev. B 86, 174512 (2012)   86(17) 1-174512   Nov 2012
We study the charge conductance of an interface between a normal metal and a
superconducting quantum anomalous Hall system, based on the recursive Green's
function. The angle resolved conductance gamma(ky, eV) with the momentum ky
parallel to the ...
Takeshi Mizushima, Masatoshi Sato, Kazushige Machida
Phys. Rev. Lett. 109, 165301 (2012)   109(16) 1-165301   Oct 2012
We here demonstrate that the superfluid 3He-B under a magnetic field in a
particular direction stays topological due to a discrete symmetry, that is, in
a symmetry protected topological order. Due to the symmetry protected
topological order, helic...
T. H. Hansson, A. Karlhede, Masatoshi Sato
New Journal of Physics 14 (2012) 063017   14    Jun 2012
We propose a topological field theory for a spin-less two-dimensional chiral
superconductor that contains fundamental Majorana fields. Due to a fermionic
gauge symmetry, the Majorana modes survive as dynamical degrees of freedom only
at magnetic v...
Masatoshi Sato, Kazuki Hasebe, Kenta Esaki, Mahito Kohmoto
Prog. Theor. Phys. 127 (2012), 937-974   127(6) 937-974   Jun 2012
For ordinary hermitian Hamiltonians, the states show the Kramers degeneracy
when the system has a half-odd-integer spin and the time reversal operator
obeys \Theta^2=-1, but no such a degeneracy exists when \Theta^2=+1. Here we
point out that for ...
Ai Yamakage, Keiji Yada, Masatoshi Sato, Yukio Tanaka
Phys. Rev. B 85, 180509(R) (2012)   85(18) 1-180509   May 2012
We develop a theory of the tunneling spectroscopy for superconducting
topological insulators (STIs), where the surface Andreev bound states (SABSs)
appear as helical Majorana fermions. Based on the symmetry and topological
nature of parent topolog...
Yukio Tanaka, Masatoshi Sato, Naoto Nagaosa
J. Phys. Soc. Jpn. 81, 011013 (2012)   81(1) 1-11013   Dec 2011
Superconductivity is a phenomenon where the macroscopic quantum coherence
appears due to the pairing of electrons. This offers a fascinating arena to
study the physics of broken gauge symmetry. However, the important symmetries
in superconductors ...
Kenta Esaki, Masatoshi Sato, Kazuki Hasebe, Mahito Kohmoto
Phys. Rev. B 84, 205128 (2011)   84(20) 1-205128   Nov 2011
Topological stability of the edge states is investigated for non-Hermitian
systems. We examine two classes of non-Hermitian Hamiltonians supporting real
bulk eigenenergies in weak non-Hermiticity: SU(1,1) and SO(3,2) Hamiltonians.
As an SU(1,1) Ha...
Satoshi Sasaki, M. Kriener, Kouji Segawa, Keiji Yada, Yukio Tanaka, Masatoshi Sato, Yoichi Ando
Phys. Rev. Lett. 107, 217001 (2011)   107(21) 1-217001   Nov 2011
A topological superconductor (TSC) is characterized by the
topologically-protected gapless surface state that is essentially an Andreev
bound state consisting of Majorana fermions. While a TSC has not yet been
discovered, the doped topological ins...
Akihiro Ii, Keiji Yada, Masatoshi Sato, Yukio Tanaka
Physical Review B   83(22) 1-224524   Jun 2011
Masatoshi Sato, Yukio Tanaka, Keiji Yada, Takehito Yokoyama
Phys. Rev. B 83, 224511 (2011)   83(22) 1-224511   Jun 2011
A theory of dispersionless Andreev bound states on surfaces of time-reversal
invariant unconventional superconductors is presented. The generalized
criterion for the dispersionless Andreev bound state is derived from the
bulk-edge correspondence, ...
Akihiro Ii, Keiji Yada, Masatoshi Sato, Yukio Tanaka
   Mar 2011
We study the edge states for a quantum anomalous Hall system (QAHS) coupled
with a spin-singlet s-wave superconductor through the proximity effect, and
clarify the topological nature of them. When we consider a superconducting pair
potential induc...
Keiji Yada, Masatoshi Sato, Yukio Tanaka, Takehito Yokoyama
Phys. Rev. B 83, 064505 (2011)   83(6) 1-64505   Feb 2011
We study Andreev bound state (ABS) and surface density of state (SDOS) of
non-centrosymmetric superconductor where spin-singlet Tex-wave pairing mixes
with spin-triplet Tex (or Tex-wave one by spin-orbit coupling. For Tex-wave pairing, A...
Masatoshi Sato, Satoshi Fujimoto
Phys. Rev. Lett. 105:217001,2010   105(21) 1-217001   Nov 2010
We demonstrate that Majorana fermions exist in edges of systems and in a
vortex core even for superconductors with nodal excitations such as the d-wave
pairing state under a particular but realistic condition in the case with an
anti-symmetric spi...
Masatoshi Sato, Yoshiro Takahashi, Satoshi Fujimoto
Phys.Rev.B82:134521,2010   82(13) 1-134521   Oct 2010
The non-Abelian topological order for superconductors is characterized by the
existence of zero-energy Majorana fermions in edges of systems and in a vortex
of a macroscopic condensate, which obey the non-Abelian statistics. This paper
is devoted ...
Yukio Tanaka, Yoshihiro Mizuno, Takehito Yokoyama, Keiji Yada, Masatoshi Sato
Phys. Rev. Lett. 105, 097002 (2010)   105(9) 1-97002   Aug 2010
We study edge states of non-centrosymmetric superconductors where
spin-singlet d-wave pairing mixes with spin-triplet p (or f)-wave one by
spin-orbit coupling. For dxy-wave pairing, the obtained Andreev bound state has
an anomalous dispersion as c...
Masatoshi Sato
Phys. Rev. B 81, 220504(R) (2010)   81(22) 1-220504   Jun 2010
In this letter, we investigate topological phases of full-gapped odd-parity
superconductors, which are distinguished by the bulk topological invariants and
the topologically protected gapless boundary states. Using the particle-hole
symmetry, we i...
Masatoshi Sato, Yoshiro Takahashi, Satoshi Fujimoto
Physica C   470 978-979   Oct 2009
Kenta Esaki, Masatoshi Sato, Mahito Kohmoto, Bertrand I. Halperin
Phys. Rev. B 80, 125405 (2009)   80(12) 1-125405   Sep 2009
We present systematic study of zero modes and gaps by introducing effects of
anisotropy of hopping integrals for a tight-binding model on the honeycomb
lattice in a magnetic field. The condition for the existence of zero modes is
analytically deri...
Masatoshi Sato, Yoshiro Takahashi, Satoshi Fujimoto
Phys. Rev. Lett. 103, 020401 (2009)   103(2) 1-20401   Jul 2009
We show that in s-wave superfluids of cold fermionic atoms with
laser-field-generated effective spin-orbit interactions, a topological phase
with gapless edge states and Majorana fermion quasiparticles obeying the
non-Abelian statistics is realize...
Masatoshi Sato
Phys. Rev. B79, 214526 (2009)   79(21) 1-214526   Jun 2009
We report intimate relations between topological properties of full gapped
spin-triplet superconductors with time-reversal invariance and the Fermi
surface topology in the normal states. An efficient method to calculate the Z2
invariants and the w...
Kenta Esaki, Masatoshi Sato, Mahito Kohmoto
Physical Review E   79(5,Pt.2) 1-56226   May 2009
Propagation of waves in the Cantor-set media is investigated by a
renormalization-group type method. We find fixed points for complete
reflection, Tex, and for complete transmission, Tex. In addition, the
wave numbers for which transmissio...
Masatoshi Sato, Satoshi Fujimoto
Phys. Rev. B79, 094504 (2009)   79(9) 1-94504   Mar 2009
The existence of edge states and zero energy modes in vortex cores is a
hallmark of topologically nontrivial phases realized in various condensed
matter systems such as the fractional quantum Hall states, p+ip
superconductors, and Z_2 insulators (...
Kenta Esaki, Masatoshi Sato, Mahito Kohmoto
Physical Review E   79(5,Pt.2) 1-56226   Jan 2009
Propagation of waves through Cantor-set media is investigated by
renormalization-group analysis. For specific values of wave numbers,
transmission coefficients are shown to be governed by the logistic map, and in
the chaotic region, they show sens...
Sato Masatoshi, Tobe Daijiro, Kohmoto Mahito
PHYSICAL REVIEW B   78(23)    Dec 2008   [Refereed]
Sato Masatoshi
PHYSICAL REVIEW D   77(4)    Feb 2008   [Refereed]
Tobe Daijiro, Kohmoto Mahito, Sato Masatoshi, Wu Yong-Shi
PHYSICAL REVIEW B   75(24)    Jun 2007   [Refereed]
Ohira Kenji, Sato Masatoshi, Kohmoto Mahito
PHYSICAL REVIEW E   75(4)    Apr 2007   [Refereed]
Sato Masatoshi, Kohmoto Mahito, Wu Yong-Shi
PHYSICAL REVIEW LETTERS   97(1)    Jul 2006   [Refereed]
Sato Masatoshi
PHYSICAL REVIEW B   73(21)    Jun 2006   [Refereed]
Masatoshi Sato, Toshiaki Tanaka
Mod.Phys.Lett. A 20 (2005) 881-896      Nov 2004
We examine in detail nonperturbative corrections for low lying energies of a
symmetric triple-well potential with non-equivalent vacua, for which there have
been disagreement about asymptotic formulas and controversy over the validity
of the dilut...
Masatoshi Sato
Phys.Lett. B575 (2003) 126-130      Jul 2003
We examine an axion string coupled to a Majorana fermion. It is found that
there exist a Majorana-Weyl zero mode on the string. Due to the zero mode, the
axion strings obey non-abelian statistics.
Hiroshi Miki, Masatoshi Sato, Mahito Kohmoto
Phys.Rev.E68(2003)061906      Jun 2003
We examine the dependence of the physical quantities of the rotatory
molecular motor, such as the rotation velocity and the proton translocation
rate, on the chemical reaction rate using the model based only on diffusion
process. A peculiar behavi...
Masatoshi Sato, Toshiaki Tanaka
J.Math.Phys. 43 (2002) 3484-3510      Sep 2001
We investigate particular models which can be N-fold supersymmetric at
specific values of a parameter in the Hamiltonians. The models to be
investigated are a periodic potential and a parity-symmetric sextic triple-well
potential. Through the quan...
Hideaki Aoyama, Noriko Nakayama, Masatoshi Sato, Toshiaki Tanaka
Phys.Lett.B521:400-408,2001      Aug 2001
Type A N-fold supersymmetry of one-dimensional quantum mechanics can be
constructed by using sl(2) generators represented on a finite dimensional
functional space. Using this sl(2) formalism we show a general method of
constructing Type A N-fold s...
Hideaki Aoyama, Noriko Nakayama, Masatoshi Sato, Toshiaki Tanaka
Phys.Lett. B519 (2001) 260-268      Jul 2001
N-fold supersymmetry is an extension of the ordinary supersymmetry in
one-dimensional quantum mechanics. One of its major property is
quasi-solvability, which means that energy eigenvalues can be obtained for a
portion of the spectra. We show that...
Hideaki Aoyama, Masatoshi Sato, Toshiaki Tanaka
Nucl.Phys. B619 (2001) 105-127      Jun 2001
We report general properties of N-fold supersymmetry in one-dimensional
quantum mechanics. N-fold supersymmetry is characterized by supercharges which
are N-th polynomials of momentum. Relations between the anti-commutator of the
supercharges and ...
Hideaki Aoyama, Masatoshi Sato, Toshiaki Tanaka
Phys.Lett. B503 (2001) 423-429      Dec 2000
We report general forms of one family of the N-fold supersymmetry in
one-dimensional quantum mechanics. The N-fold supersymmetry is characterized by
the supercharges which are N-th order in differential operators. The family
reported here is defin...
Hideaki Aoyama, Masatoshi Sato, Toshiaki Tanaka, Mariko Yamamoto
Phys.Lett. B498 (2001) 117-122      Nov 2000
We report a new type of supersymmetry, "N-fold supersymmetry", in
one-dimensional quantum mechanics. Its supercharges are N-th order polynomials
of momentum: It reduces to ordinary supersymmetry for N=1, but for other values
of N the anticommutato...
Masatoshi Sato, Mahito Kohmoto
J. Phys. Soc. Jpn. 69 (2000) 3505      Mar 2000
The unique Fermi surfaces and their nesting properties of Sr2RuO4 are
considered. The existence of unconventional superconductivity is shown
microscopically, for the first time, from the magnetic interactions (due to
nesting) and the phonon-mediat...
Hideaki Aoyama, Hisashi Kikuchi, Ikuo Okouchi, Masatoshi Sato, Shinya Wada
Nucl.Phys. B553 (1999) 644-710      Aug 1998
The elucidation of the properties of the instantons in the topologically
trivial sector has been a long-standing puzzle. Here we claim that the
properties can be summarized in terms of the geometrical structure in the
configuration space, the vall...
Hideaki Aoyama, Hisashi Kikuchi, Ikuo Okouchi, Masatoshi Sato, Shinya Wada
Phys.Lett. B424 (1998) 93-100      Oct 1997
Conventionally, perturbative and non-perturbative calculations are performed
independently. In this paper, valleys in the configuration space in quantum
mechanics are investigated as a way to treat them in a unified manner. All the
known results o...
Hideaki Aoyama, Toshiyuki Harano, Hisashi Kikuchi, Ikuo Okouchi, Masatoshi Sato, Shinya Wada
Prog.Theor.Phys.Suppl.127:1-92,1997      Apr 1997
Path-integral approach in imaginary and complex time has been proven
successful in treating the tunneling phenomena in quantum mechanics and quantum
field theories. Latest developments in this field, the proper valley method in
imaginary time, its...
Toshiyuki Harano, Masatoshi Sato
Nucl.Phys. B484 (1997) 167-195      Aug 1996
Microscopic tests of the exact results are performed in Tex supersymmetric
Tex QCD. We present the complete construction of the multi-instanton in
Tex supersymmetric QCD. All the defining equations of the super instanton are
reduced to the...
Hideaki Aoyama, Toshiyuki Harano, Masatoshi Sato, Shinya Wada
Phys.Lett. B388 (1996) 331-337      Jul 1996
Microscopic tests of the exact results are performed in N=2 SU(2)
supersymmetric QCD. We construct the multi-instanton solution in N=2
supersymmetric QCD and calculate the two-instanton contribution Tex to
the prepotential Tex expl...
Hideaki Aoyama, Toshiyuki Harano, Hisashi Kikuchi, Masatoshi Sato, Shinya Wada
Phys.Rev.Lett. 79 (1997) 4052-4055      Jun 1996
We study the path-integral formalism in the imaginary-time to show its
validity in a case with a metastable ground state. The well-known method based
on the bounce solution leads to the imaginary part of the energy even for a
state that is only me...
Hideaki Aoyama, Toshiyuki Harano, Masatoshi Sato, Shinya Wada
Nucl.Phys. B466 (1996) 127-158      Dec 1995
Based on the new valley equation, we propose the most plausible method for
constructing instanton-like configurations in the theory where the presence of
a mass scale prevents the existence of the classical solution with a finite
radius. We call t...
Masatoshi Sato
Phys.Lett. B376 (1996) 41-47      Aug 1995
The relation between shapes of cosmic string and baryon number violation is
investigated. If there exist fermionic zero modes on the string, using
bosonization technique, it is possible to obtain the effective action which
describes the fermion co...
Hideaki Aoyama, Toshiyuki Harano, Masatoshi Sato, Shinya Wada
Mod.Phys.Lett. A11 (1996) 43-54      Jul 1995
The instanton configuration in the SU(2)-gauge system with a Higgs doublet is
constructed by using the new valley method. This method defines the
configuration by an extension of the field equation and allows the exact
conversion of the quasi-zero...
Masatoshi Sato, Shigeaki Yahikozawa
Nucl.Phys.B436:100-128,1995      Jul 1994
We present a ``topological'' formulation of arbitrarily shaped vortex strings
in four dimensional field theory. By using a large Higgs mass expansion, we
then evaluate the effective action of the closed Abrikosov-Nielsen-Olesen
vortex string. It i...

Misc

 
Peng Zhang, Zhijun Wang, Yukiaki Ishida, Yoshimitsu Kohama, Xianxin Wu, Koichiro Yaji, Yue Sun, Cedric Bareille, Kenta Kuroda, Takeshi Kondo, Kozo Okazaki, Koichi Kindo, Kazuki Sumida, Shilong Wu, Koji Miyamoto, Taichi Okuda, Hong Ding, G. D. Gu, Tsuyoshi Tamegai, Ronny Thomale, Takuto Kawakami, Masatoshi Sato, Shik Shin
Part of Nature Physics 15, 41 (2019) (See also arXiv 1809.09977)      Mar 2018
Topological Dirac semimetals (TDSs) exhibit bulk Dirac cones protected by
time reversal and crystal symmetry, as well as surface states originating from
non-trivial topology. While there is a manifold possible onset of
superconducting order in suc...
Zongping Gong, Naoto Kura, Masatoshi Sato, Masahito Ueda
   Apr 2019
A quantum quench is the simplest protocol to investigate nonequilibrium
many-body quantum dynamics. Previous studies on the entanglement properties of
quenched quantum many-body systems mainly focus on the growth of entanglement
entropy. Several r...
Nobuyuki Okuma, Masatoshi Sato
   Apr 2019
Quantum phase transitions are intriguing and fundamental cooperative
phenomena in physics. Analyzing a superconducting nanowire with spin-dependent
non-Hermitian hopping, we discover a topological quantum phase transition
driven by infinitesimal c...
Kohei Kawabata, Takumi Bessho, Masatoshi Sato
   Feb 2019
Exceptional points are universal level degeneracies induced by
non-Hermiticity. Whereas the past decades witnessed their new physics, the
unified understanding has yet to be obtained. Here we present the complete
classification of generic topologi...
Kohei Kawabata, Ken Shiozaki, Masahito Ueda, Masatoshi Sato
   Dec 2018
We develop a complete theory of symmetry and topology in non-Hermitian
physics. We demonstrate that non-Hermiticity ramifies the celebrated
Altland-Zirnbauer symmetry classification for insulators and superconductors.
In particular, charge conjuga...
Shingo Kobayashi, Ai Yamakage, Yukio Tanaka, Masatoshi Sato
   Dec 2018
In contrast to elementary Majorana particles, emergent Majorana fermions
(MFs) in condensed-matter systems may have electromagnetic multipoles. We
developed a general theory of magnetic multipoles for surface helical MFs on
time-reversal-invariant...
Ken Shiozaki, Masatoshi Sato, Kiyonori Gomi
   Feb 2018
We study the Atiyah-Hirzebruch spectral sequence (AHSS) for equivariant
K-theory in the context of band theory. Various notions in the band theory such
as irreducible representations at high-symmetric points, the compatibility
relation, topologica...
Takuto Kawakami, Tetsuya Okamura, Shingo Kobayashi, Masatoshi Sato
   Feb 2018
We present a theory of topological crystalline materials of Tex
electrons. The high spin topological phases are expected to be realized in
cubic crystals with band inversion such as antiperovskite materials, Tex with ${\rm A}=(...
Igor Kuzmenko, Tetyana Kuzmenko, Yshai Avishai, Masatoshi Sato
   Jan 2018
In this work we study the possible occurrence of topological insulators for
2D fermions of high spin. They can be realized in cold fermion systems with
ground-state atomic spin Tex, if the optical potential is properly
designed, and s...
Toshiaki Tanaka, Masatoshi Sato
   Nov 2002
Through a nonperturbative analysis on a sextic triple-well potential, we
reveal novel aspects of the dynamical property of the system in connection with
N-fold supersymmetry and quasi-solvability.
Hiroshi Miki, Masatoshi Sato, Mahito Kohmoto
   Nov 2004
The pump process of the ratchet model inspired by the Tex rotatory motor of
ATP synthase is investigated. In this model there are two kinds of
characteristic time. One is dynamical, the relaxation time of the system.
Others are chemical, the che...
Mahito Kohmoto, Masatoshi Sato
   Mar 2000
Superconductive properties of the two-leg ladder compounds are studied
theoretically. The antiferromagnetic fluctuations are considered because of the
good nesting of the Fermi surfaces. The attractive interaction which is most
likely due to the e...
Mahito Kohmoto, Masatoshi Sato
   Jan 2000
We consider a system with electron-phonon interaction, antiferromagnetic
fluctuations and disconnected open Fermi surfaces. The existence of odd-parity
superconductivity in this circumstance is shown for the first time. If it is
applied to the qua...
Toshiyuki Harano, Masatoshi Sato
   Mar 1997
We calculate the cross sections of the baryon and lepton number violating
processes. The proper valley method enables us to calculate the multi-boson
processes, which have the possibility to observation. The mass corrections of
the gauge boson, Hi...

Conference Activities & Talks

 
Topologicla Crystalline Materials: A Theoretical Approach [Invited]
SATO Masatoshi
23 Mar 2018   
Topological Crystalline Materials of J=3/2 Electrons [Invited]
SATO Masatoshi
Seminar at National Center for Theoretical Science Physics Division (Hsinchu, Taiwan)   27 Feb 2018   
Superconducting Topological Crystalline Materials [Invited]
SATO Masatoshi
Croucher and IAS Conference on Topological Phases and Topological Quantum Computation (HongKong)   19 Dec 2017   
Topological Crystalline Materials [Invited]
SATO Masatoshi
Invited lecture in Seminar Course on “Topology and Interactions in Solids", ETH Institute for Theoretical Studies, Zurich   14 Dec 2017   
Topological Crystalline Materials and Superconductors [Invited]
SATO Masatoshi
Oxide Superspin 2017 (OSS2017) (Kyoto Univ., Kyoto)   28 Nov 2017   
Superconducting Topological Materials [Invited]
SATO Masatoshi
CEMS Symposium on Trends in Condensed Matter Physics, (RIKEN, Saitama)   7 Nov 2017   
Topological Superconductivity in Topological Materials [Invited]
SATO Masatoshi
22 Sep 2017   
Nodal Topological Superconductors [Invited]
SATO Masatoshi
International Conference on Topological Matter and Flat Bands, Leipzig University,   20 Aug 2017   
Nodeless and Nodal Topological Crystalline Superconductors" [Invited]
SATO Masatoshi
28th International Conference on Low Temperature Physics, (Gothenburg, Sweden)   12 Aug 2017   
Topological Crystalline Materials [Invited]
SATO Masatoshi
Superstripes 2017, International Conference in Complex Matter, Superconductivity, Magnetism and Ferroelectricity, (Ischia, Italy)   9 Jun 2017   
Topological Crystalline Materials [Invited]
SATO Masatoshi
International Conference on Topological Materials Science 2017 (TopoMat2017), (Tokyo Tech, Tokyo)   13 May 2017   
Topological Crystalline Materials [Invited]
SATO Masatoshi
YITP-PKU-TMS International school on topological science and topological matters, (Kyoto)   18 Feb 2017   
Topological superconductivity in Dirac metals [Invited]
SATO Masatoshi
16 Dec 2016   
Exotic (surface) states in topological phases [Invited]
SATO Masatoshi
phases", M. Sato, EPiQS-TMS Trans-Pacific Conference on Topological Quantum Materials, (Moorea, Tahiti)   4 Dec 2016   
Topological superconductivity in topological materials [Invited]
SATO Masatoshi
第7回トポロジー連携研究会, (Yokohama)   18 Nov 2016   
Topological superconductivity in Dirac metals [Invited]
SATO Masatoshi
17 Nov 2016   
Topological superconductors and Majorana fermions [Invited]
SATO Masatoshi
KVA-JPSJ seminar (Goteborg, Sweden)   3 Nov 2016   
Topological superconductivity in Topological Materials [Invited]
SATO Masatoshi
KVA-JPSJ seminar (Stockholm, Sweden)   1 Nov 2016   
Topological superconductors and Majorana fermions [Invited]
SATO Masatoshi
KVA-JPSJ seminar (Uppsala, Sweden)   26 Oct 2016   
対称性とトポロジカル相 [Invited]
SATO Masatoshi
量子系の数理と物質制御への展開II:量子ウォークを架け橋に (Yokohama)   21 Oct 2016   
Nonsymmorphic symmetry and new topological phases [Invited]
SATO Masatoshi
YITP workshop BEC2016: Physics of bulk-edge correspondence & its universality – From solid state physics to cold atoms (Kyoto)   27 Sep 2016   
Topological superconductivity in materials with strong spin-orbit coupling [Invited]
SATO Masatoshi
TOPO MAT meeting (Stuttgart, Germany)   21 Sep 2016   
Non-Hermitian Topological Phases [Invited]
SATO Masatoshi
PHHQP16: Progress in Quantum Physics with Non-Hermitian Operators (Kyoto)   10 Aug 2016   
Topological phases in noncentrosymmetric superconductors/superfluids
Quantum Hall Physics -Novel systems and applications   2009   
Topological phases in noncentrosymmetric superconductors/superfluids
2009   
Non-Abelian Topological Order in s-wave superfluids of ultracold fermionic atoms
2010   
Fractionalization and Hidden Symmetry in Topological Orders
IPMU Focus Week Condensed Matter Physics Meets High Energy Physics   2010   
Topological odd-parity superconductors
SPQS2010: Statistical Physics of Quantum Systems   2010   
Majorana Fermions and Non-Abelian Topological Order in Noncentrosymmetric Superconductors
Workshop on Quantum Condensation (QC10)   2010   
Topological superconductors with spin-orbit interaction
2010   
Topology of Andreev bound state
Workshop on Quantum Condensation (QC11)   2011   
Non-Abelian topological orders in superconducting states
KITP program, Topological Insulators and Superconductors   2011   
Topological superconductos
International Workshop for Young Researchers on Topological Quantum Phenomena in Condensed Matter with Broken Symmetries   2011   
Non-Abelian topological orders in superconducting states
26th Nishinomiya-Yukawa Memorial International Workshop "Novel Quantum States in Condensed Matter 2011   2011   
Topological superconductors
2nd International Workshop on Quarks and Hadrons under Extreme Conditions - Lattice QCD, Holography, Topology, and Physics at RHIC/LHC -   2011   
Surface Majorana Fermions in Topological Superconductors
2012 Hangzhou Workshop on Quantum Matter   2012   
Topological Superconductors
TQP2012 International Conference on Topological Quantum Phenomena   2012   
Surface Majorana Fermions in Topological Superconductors
Material and Mechanism of Superconductivity (M2S)   2012   
Surface Majorana Fermions in Topological Superconductors
Topological State of Matters: Insulators, Superconductors, and Quantum Hall Liquids   2012   
Surface Majorana Fermions in Topological Superconductors
APCTP Focus Program on Quantum Condensation (QC12)   2012   
Topological Field Theory for Topological Superconductors
APCTP Focus Program on Quantum Condensation (QC12)   2012   
Symmetry Protected Majorana Fermions in Topological Superconductors
IAS Program on Topological Materials and Strongly Correlated Electronic Systems   2012   
Symmetry Protected Majorana Fermions in Topological Superconductors
QS2C Theory Forum: International Symposium on Strongly Correlated Quantum Science   2013   
Nonsymmorphic topological crystalline insulators and superconductors: Mobius twists in surface states [Invited]
SATO Masatoshi
From Quantum Field Theories to Numerical Methods (Stockholm, Sweden)