BAMBA Motoaki

J-GLOBAL         Last updated: May 8, 2019 at 15:05
BAMBA Motoaki
Kyoto University
Graduate School of Science
Job title
PRESTO Researcher
Doctor of Philosophy in Science(Osaka University)
Other affiliation
Kyoto University

Research Areas


Academic & Professional Experience

Apr 2019
Program-Specific Junior Associate Professor (JST PRESTO), Graduate School of Science, Kyoto University
Oct 2017
PRESTO Researcher, Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST)
Apr 2015
Mar 2019
Visiting Academic Staff, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
Apr 2015
Mar 2019
Associate Professor, Interactive Materials Science Cadet Program, Osaka University
Apr 2012
Mar 2015
Research Fellow (PD), Japan Society for the Promotion of Science


Apr 2004
Mar 2009
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
Apr 2000
Mar 2004
Department of Electronics and Materials Physics, School of Engineering Science, Osaka University

Awards & Honors

Feb 2018
Exploring physical systems showing super-radiant phase transitions, Research Award, Research Foundation for Opto-Science and Technology
Mar 2017
Theoretical studies on the ultrastrong light matter coupling, 11th Young Scientist Award of the Physical Society of Japan (Division 1: Atomic and Molecular physics, Quantum Electronics, Radiation), The Physical Society of Japan
Mar 2017
Superposition of light in free space and localized matters, 11th Young Scientist Award of the Physical Society of Japan (Division 5: Optical Properties of Condensed Matter), The Physical Society of Japan
Feb 2011
27th Inoue Research Award for Young Scientists, Inoue Foundation for Science
Dec 2007
Award for Encouragement of Research in Condensed Matter Photophysics, Association for Condensed Matter Photophysics

Published Papers

Motoaki Bamba, Xinwei Li, Junichiro Kono
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)      Sep 2018   [Invited]
Xinwei Li, Motoaki Bamba, Ning Yuan, Qi Zhang, Yage Zhao, Maolin Xiang, Kai Xu, Zuanming Jin, Wei Ren, Guohong Ma, Shixun Cao, Dmitry Turchinovich, Junichiro Kono
Science   361(6404) 794-797   Aug 2018   [Refereed]
The interaction of N two-level atoms with a single-mode light field is an extensively studied many-body problem in quantum optics, first analyzed by Dicke in the context of superradiance. A characteristic of such systems is the cooperative enhance...
BAMBA Motoaki
Butsuri   73(8) 540-541   Aug 2018   [Refereed][Invited]
Weilu Gao, Xinwei Li, Motoaki Bamba, Junichiro Kono
Nature Photonics      Apr 2018   [Refereed]
Non-perturbative coupling of photons and excitons produces hybrid particles, exciton–polaritons, which have exhibited a variety of many-body phenomena in various microcavity systems. However, the vacuum Rabi splitting (VRS), which defines the stre...
Xinwei Li, Motoaki Bamba, Qi Zhang, Saeed Fallahi, Geoff C. Gardner, Weilu Gao, Minhan Lou, Katsumasa Yoshioka, Michael J. Manfra, Junichiro Kono
Nature Photonics      Apr 2018   [Refereed]
A two-level system resonantly interacting with an a.c. magnetic or electric field constitutes the physical basis of diverse phenomena and technologies. However, Schrödinger’s equation for this seemingly simple system can be solved exactly only und...
BAMBA Motoaki
Abstract of Ceremony Talk of Research Award by Research Foundation for Opto-Science and Technology   4-7   Feb 2018   [Invited]
Motoaki Bamba, Nobuyuki Imoto
Physical Review A   96(5) 053857   Nov 2017   [Refereed]
Several superconducting circuit configurations are examined on the existence of superradiant phase transitions (SRPTs) in thermal equilibrium. For some configurations consisting of artificial atoms, whose circuit diagrams are however not specified...
BAMBA Motoaki
Parity   32(11) 35-40   Oct 2017   [Refereed][Invited]
BAMBA Motoaki
Solid State Physics   52(9) 459-476   Sep 2017   [Refereed][Invited]
Thanks to an ultra-strong light-matter interaction, a transverse electromagnetic field gets a static coherent amplitude spontaneously in thermal equilibrium. While this phase transition has not been observed in atomic systems, it was recently foun...
Motoaki Bamba, Kunihiro Inomata, Yasunobu Nakamura
Physical Review Letters   117(17)    Oct 2016   [Refereed]
We propose a superconducting circuit that shows a superradiant phase transition (SRPT) in thermal equilibrium. The existence of the SRPT is confirmed analytically in the limit of an infinite number of artificial atoms. We also perform a numerical ...
Motoaki Bamba, Nobuyuki Imoto
Physical Review A   94(3) 033802   Sep 2016   [Refereed]
From the Hamiltonian connecting the inside and outside of a Fabry-Perot cavity, which is derived from the Maxwell boundary conditions at a mirror of the cavity, a master equation of a non-Lindblad form is derived when the cavity embeds matters, al...
Motoaki Bamba, Tetsuo Ogawa
Physical Review A   93(3) 033811   Mar 2016   [Refereed]
We investigate theoretically the light amplification by stimulated emission of radiation (laser) in the ultrastrong light-matter interaction regime under the two-level and single-mode approximations. The conventional picture of the laser is broken...
Motoaki Bamba, Shuji Wakaiki, Hideki Ichida, Kohji Mizoguchi, DaeGwi Kim, Masaaki Nakayama, Yasuo Kanematsu
Physical Review B   91(23) 235205   Jun 2015   [Refereed]
When an exciton in semiconductor is scattered and its energy is decreased far below the resonance energy of the bare exciton state, it has been considered that an exciton-polariton is created immediately by the scattering process because there is ...
Motoaki Bamba, Tetsuo Ogawa
Physical Review A   90(6) 063825   Dec 2014   [Refereed]
The possibility of the superradiant phase transition in polarizable materials described by the minimal-coupling Hamiltonian with the longitudinal dipole-dipole interaction is examined. We try to reduce the Hamiltonian into the Dicke one in the hom...
Motoaki Bamba and Tetsuo Ogawa
Physical Review A   89(2) 023817   Feb 2014   [Refereed]
When the light interacts with matters in a lossy cavity, in the standard cavity quantum electrodynamics, the dissipation of the cavity fields is characterized simply by the strengths of the two couplings: the light-matter interaction and the syste...
T. Boulier, M. Bamba, A. Amo, C. Adrados, A. Lemaitre, E. Galopin, I. Sagnes, J. Bloch, C. Ciuti, E. Giacobino, and A. Bramati
Nature Communications   5 3260   Feb 2014   [Refereed]
The generation of squeezed and entangled light fields is a crucial ingredient for the implementation of quantum information protocols. In this context, semiconductor materials offer a strong potential for the implementation of on-chip devices oper...
Motoaki Bamba and Tetsuo Ogawa
Physical Review A   89(1) 017802   Jan 2014   [Refereed]
As mentioned by De Liberato [Phys. Rev. A 89 017801 (2014)], when we suppose the metallic thin mirror and perform the renormalization to the approach starting from the frequently used system-environment-coupling Hamiltonian, we can certainly resol...
Motoaki Bamba, Tetsuo Ogawa
Physical Review A   88(1) 013814   Jul 2013   [Refereed]
In the standard theory of cavity quantum electrodynamics (QED), coupling between photons inside and outside a cavity (cavity system and environment) is given conserving the total number of photons. However, when the cavity photons (ultrastrongly) ...
Motoaki Bamba, Tetsuo Ogawa
Physical Review A   86(6,Pt.B) 063831   Dec 2012   [Refereed]
We have investigated theoretically a dissipative polariton system in the ultrastrong light-matter coupling regime without using the rotating-wave approximation on system-reservoir coupling. Photons in a cavity and excitations in matter respectivel...
H. Tahara, M. Bamba, Y. Ogawa, and F. Minami
Physical Review B   86(23) 235208   Dec 2012   [Refereed]
We have observed a coherent spectral change of exciton-polaritons in a ZnSe epitaxial layer through spectrally resolved four-wave mixing spectroscopy. The spectra exhibit an exchange of the dominant peak position between the different polariton br...
Luc Nguyen-Thê, Simone De Liberato, Motoaki Bamba, Cristiano Ciuti
Physical Review B   87(23) 235322   Jun 2013   [Refereed]
Intersubband polaritons are light-matter excitations originating from the strong coupling between an intersubband quantum well electronic transition and a microcavity photon mode. In this paper, we study how the Coulomb electron-electron interacti...
Motoaki Bamba, Cristiano Ciuti
Applied Physics Letters   99(17) 171111   Oct 2011   [Refereed]
We propose a scheme for the resonant generation of counter-polarized single
photons in double asymmetric cavities with a small Kerr optical nonlinearity
(as that created by a semiconductor quantum well) compared to the mode
broadening. Due to the ...
Motoaki Bamba, Atac Imamoğlu, Iacopo Carusotto, and Cristiano Ciuti
Physical Review A   83(2) 021802(R)   Feb 2011   [Refereed]
Motoaki Bamba and Hajime Ishihara
Physical Review B   84(4) 045125   Jul 2011   [Refereed]
Motoaki Bamba and Hajime Ishihara
Physical Review Letters   105(12) 1-123906   Sep 2010   [Refereed]
Motoaki Bamba, Simon Pigeon, and Cristiano Ciuti
Physical Review Letters   104(21) 1-213604   May 2010   [Refereed]
Lydie Ferrier and Simon Pigeon and Esther Wertz and Motoaki Bamba and Pascale Senellart and Isabelle Sagnes and Aristide Lemaitre and Cristiano Ciuti and Jacqueline Bloch
Applied Physics Letters   97(3) 031105   Jul 2010   [Refereed]
Motoaki Bamba and Hajime Ishihara
Physical Review B   80(12) 125319   Sep 2009   [Refereed]
Motoaki Bamba
Osaka University      Mar 2009
Motoaki Bamba and Hajime Ishihara
Journal of the Physical Society of Japan   78(4) 043701   Feb 2009   [Refereed]
Motoaki Bamba and Hajime Ishihara
physica status solidi (c)   6(1) 128   Oct 2008   [Refereed]
Motoaki Bamba and Hajime Ishihara
Physical Review B   78(8) 085109   Aug 2008   [Refereed]
Motoaki Bamba and Hajime Ishihara
physica status solidi (c)   5(7) 2387   Feb 2008   [Refereed]
H. Ishihara, A. Syouji, Y. Segawa, and M. Bamba
Journal of Physics: Condensed Matter   19(44) 445008   Oct 2007   [Refereed]
Motoaki Bamba and Hajime Ishihara
physica status solidi (c)   3(10) 3460   Oct 2006   [Refereed]
K. Cho, J. Ushida, and M. Bamba
Journal of the Physical Society of Japan   74(11) 3088-3092   Aug 2005   [Refereed]


Motoaki Bamba, Xinwei Li, Junichiro Kono
   Jan 2019
Traditionally, strong-field physics explores phenomena in matter (atoms,
molecules, and solids) driven by an extremely strong laser field
nonperturbatively. However, even in the complete absence of an external
electromagnetic field, strong-field p...

Conference Activities & Talks

BAMBA Motoaki
Ceremony of Research Award by Research Foundation for Opto-Science and Technology   28 Feb 2018   Research Foundation for Opto-Science and Technology

Association Memberships


Research Grants & Projects

Japan Science and Technology Agency (JST): Precursory Research for Embryonic Science and Technology (PRESTO)
Project Year: Oct 2017 - Mar 2021    Investigator(s): BAMBA Motoaki
In order to push the frontier of quantum technologies into the real societies, we try to establish a strategy for overcoming the trade-off between controlling and protecting quantum states. In contrast to the conventional way relying on the suppre...
JSPS: Grant-in-Aid for Scientific Research (B)
Project Year: Apr 2014 - Mar 2018    Investigator(s): OGAWA Tetsuo
JSPS: Grant-in-Aid for JSPS Fellows
Project Year: Apr 2012 - Mar 2015    Investigator(s): BAMBA Motoaki
JSPS: Grant-in-Aid for JSPS Fellows
Project Year: Apr 2007 - Mar 2009    Investigator(s): BAMBA Motoaki