Shiro KAWABATA

Senior Researcher, Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

■ Description of Research [184KB]

RESEARCH

I have been theoretically investigating various quantum phenomena in superconducting nanostructures, such as macroscopic quantum tunneling, macroscopic quantum coherence, and Josephson π-states. In addition to such fundamental researches, application studies of these novel phenomena to quantum computation and quantum information have been also developed in strong collaboration with many experimental groups.

In this research project, I will develop a theory of quantum transport in superconductor/ferromagnet hybrid nanosystems and explore exotic quantum phenomena e.g. odd frequency pairing and anomalous proximity effect in a ferromagnetic-insulator based Josepshon junction.

EDUCATION

1995

Master of Engineering (Crystalline Material Science), Nagoya University

1998

Ph.D. (Applied Physics), Osaka City University

PROFESSIONAL EXPERIENCE

1998-2001

Researcher, Electrotechnical Laboratory (ETL)

2001-2005

Researcher, Nanotechnology Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST)

2005-2010

Senior Researcher, NRI, AIST

2010-Present

Senior Researcher, Nanosystem Research Institute, AIST

SELECTION OF PUBLICATIONS

"Josephson π-state in a ferromagnetic insulator",
S. Kawabata, Y. Asano, Y. Tanaka, A. A. Golubov, and S. Kashiwaya,
Phys. Rev. Lett. 104, 117002 (2010).

"Theory of quantum transport in Josephson junctions with a ferromagnetic insulator",
S. Kawabata and Y. Asano,
Low Temp. Phys. 36, 1143 (2010).

"Multi-junction switching in Bi2Sr1.6La0.4CuO6+δ intrinsic Josephson junctions",
H. Kashiwaya, T. Matsumoto, H. Shibata, H. Eisaki, Y. Yoshida, S. Kawabata, and S. Kashiwaya,
Appl. Phys. Exp. 3, 043101 (2010).

"Theory of two-dimensional macroscopic quantum tunneling in YBa2Cu3O7-δ Josephson junctions coupled with an LC circuit",
S. Kawabata, T. Bauch, and T. Kato,
Phys. Rev. B 80, 174513 (2009).

"Theory of Macroscopic Quantum Tunneling in High-Tc c-Axis Josephson Junctions",
T. Yokoyama, S. Kawabata, T. Kato, and Y. Tanaka,
Phys. Rev. B 76 , 134501 (2007).

"Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions",
S. Kawabata, A. A. Golubov, Ariando, C. J. M. Verwijs, H. Hilgenkamp, and J. R. Kirtley,
Phys. Rev. B 76, 064505 (2007).

"Macroscopic quantum dynamics of π-junctions with ferromagnetic insulators",
S. Kawabata, S. Kashiwaya, Y. Asano and Y. Tanaka, and A. A. Golubov,
Phys. Rev. B 74, 180502(R) (2006).

"Effect of Zero Energy Bound States on Macroscopic Quantum Tunneling in High-Tc Superconductor Junctions",
S. Kawabata, S. Kashiwaya, Y. Asano and Y. Tanaka,
Phys. Rev. B 72, 052506 (2005).

"Macroscopic Quantum Tunneling in a d-wave High-Tc Bi2Sr2CaCu2O Superconductor",
K. Inomata, S. Sato, K. Nakajima, A. Tanaka, Y. Takano, H. B. Wang, M. Nagao, T. Hatano and S. Kawabata,
Phys. Rev. Lett. 95, 107005 (2005).

"Macroscopic Quantum Tunneling and Quasiparticle Dissipation in d-wave Superconductor Josephson Junctions",
S. Kawabata, S. Kashiwaya, Y. Asano and Y. Tanaka,
Phys. Rev. B 70, 132505 (2004).

"Information Theoretical Approach to Control of Quantum Mechanical Systems",
S. Kawabata,
Phys. Rev. A 68, 064302 (2003).