OKUNISHI Kouichi

J-GLOBAL         Last updated: Nov 5, 2019 at 15:35
 
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Name
OKUNISHI Kouichi
Affiliation
Niigata University
Section
Faculty of Science Department of Physics
Degree
(BLANK)(Osaka University)
Research funding number
30332646

Research Interests

 
 

Academic & Professional Experience

 
1996
 - 
1999
 
1999
 - 
2000
 
2000
   
 
- Niigata University, Research assistant
 

Education

 
 
 - 
1999
Graduate School, Division of Natural Science, Osaka University
 

Published Papers

 
Kouichi Okunishi and Kouichi Seki
Journal of the Physical Society of Japan   88(11) 114002   Nov 2019   [Refereed]
Seki Kouichi, Okunishi Kouichi
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   88(2)    Feb 2019   [Refereed]
Okunishi Kouichi, Onozato Yoshitaka, Seki Kouichi
AIP ADVANCES   8(10)    Oct 2018   [Refereed]
Miyajima Mizuki, Astuti Fahmi, Kakuto Takeshi, Matsuo Akira, Sari Dita Puspita, Asih Retno, Okunishi Kouichi, Nakano Takehito, Nozue Yasuo, Kindo Koichi, Watanabe Isao, Kambe Takashi
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   87(6)    Jun 2018   [Refereed]
Ueda Hiroshi, Okunishi Kouichi, Kremar Roman, Gendiar Andrej, Yunoki Seiji, Nishino Tomotoshi
PHYSICAL REVIEW E   96(6)    Dec 2017   [Refereed]

Misc

 
Kouichi Seki, Kouichi Okunishi
J. Phys. Soc. Jpn. 87, 023001 (2018)      Oct 2017
Using the event-chain Monte Carlo (MC) algorithm, we investigate phase
transitions of the stacked Kagome Heisenberg systems with classical vector
spins including up to the 3rd-nearest-neighbor couplings. In particular, we
focus on two types of non...
Kouichi Seki, Kouichi Okunishi
   Jun 2017
We introduce a snapshot density matrix and snapshot spectrum for world-line
(WL) quantum Monte Carlo simulations, by integrating out the
continuous-imaginary-time index of WL snapshots. For the transverse-field Ising
chain, we reveal fundamental p...
Kouichi Okunishi
Prog. Theor. Exp. Phys. (2016) 063A02      Mar 2016
Motivated by sine-square deformation (SSD) for quantum critical systems in
1+1-dimension, we discuss a Mobius quantization approach to the two-dimensional
conformal field theory (CFT), which bridges the conventional radial
quantization and the dip...
Kouichi Seki, Kouichi Okunishi
Phys. Rev. B 91, 224403 (2015)      Feb 2015
Using Monte Carlo simulations, we explore the magnetic phase diagram of the
triangular spin tubes coupled with a ferromagnetic inter-tube interaction for
CsCrF4. A planar structure of the coupled tubes is topologically equivalent to
the Kagome-tri...
H. Yamaguchi, H. Miyagai, M. Yoshida, M. Takigawa, K. Iwase, T. Ono, N. Kase, K. Araki, S. Kittaka, T. Sakakibara, T. Shimokawa, T. Okubo, K. Okunishi, A. Matsuo, Y. Hosokoshi
Phys. Rev. B 89, 220402(R) (2014)      Jun 2014
We report magnetization, specific heat, and NMR measurements of 3-Br-4-F-V
[=3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl], a strong-rung S=1/2
Heisenberg spin ladder with ferromagnetic leg interactions. We explain the
magnetic and thermodynami...

Books etc

 
Transfer matrix approach to classical systems(共著)
Springer, Berlin   1999   
density matrix renormalization for classical lattice models(共著)
Springer, Berlin   1997   

Conference Activities & Talks

 
A low-energy effective model for the S=1/2 Kagome-triangular-strip Heisenberg model
OKUNISHI Kouichi
ICM2018 SanFrancisco   17 Jul 2018   
Sine-square deformation and Mobius quantization of 2D CFTs
OKUNISHI Kouichi
30 Jun 2017   
Sine-square defomrantion and Mobius quantization for 2D CFT
OKUNISHI Kouichi
TNSAA Taiwan   12 Dec 2016   
Sine-Square deformation and Mobius qunatization in 2D CFT
OKUNISHI Kouichi
Quantum Information in String Theory and Many-body Systems, Yukawa Institute   2 Jun 2016   

Research Grants & Projects

 
JSPS: Kakenhi
Project Year: Apr 2017 - Mar 2021    Investigator(s): OKUNISHI Kouichi
JSPS: Kakenhi
Project Year: Apr 2014 - Mar 2018    Investigator(s): OKUNISHI Kouichi
JSPS: Kakenhi
Project Year: Apr 2011 - Mar 2014    Investigator(s): OKUNISHI Kouichi
MEXT: Kakenhi
Project Year: Apr 2008 - Mar 2010    Investigator(s): OKUNISHI Kouichi
JSPS: Kakenhi
Project Year: Apr 2006 - Mar 2009    Investigator(s): OKUNISHI Kouichi