Youichi YANASE

Associate Professor, Department of Physics, Niigata University

Topics of Research：: Microscopic theory of non-centrosymmetric superconductivity based on multi-orbital models

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■ Description of Research [1057KB]

RESEARCH

My research interests have been focused on the exotic superconductivity and superfluidity in strongly correlated systems.I studied spin-triplet superconductivity, Fulde-Ferrell-Larkin-Ovchinnikov superconductivity/superfluidity, non-centrosymmetric superconductivity, and locally non-centrosymmetric superconductivity on the basis of the electronic structure of materials　by combining the microscopic many body theory and semi-macroscopic phenomenological theories,.

In this project I will study the non-centrosymmetric superconductors with orbital degree of freedom. Since the antisymmetric spin-orbit coupling, such as Rashba spin-orbit coupling, arises from the orbital degree of freedom, it is desired to study non-centrosymmetric systems on the basis of multi-orbital models. My project is intended to reveal the novel quantum phenomena arising from the synergy of orbital degree of freedom and non-centrosymmetric crystal structure.

EDUCATION

1996: B.Sc. in Physics, Kyoto University
1998: M.S. in Physics, Kyoto University (Advisor: Kosaku Yamada)
2001: Ph.D. in Physics, Kyoto University (Advisor: Kosaku Yamada)

PROFESSIONAL EXPERIENCE

2000-2007: Research Associate, Department of Physics, University of Tokyo
2006-2007: Visiting Scientist, ETH-Hoenggerberg (Zurich),
Switzerland (Host: Manfred Sigrist)
2007-2009: Assistant Professor, Department of Physics, University of Tokyo
2009-Present: Associate Professor, Department of Physics, Niigata University

HONORS AND AWARDS

2011: Young Scientist Award of the Physical Society of Japan
2013: Research Award for Heavy Fermions

SELECTION OF PUBLICATIONS

"Complex-stripe phases induced by staggered Rashba spin-orbit coupling",
T. Yoshida, M. Sigrist, and Y. Yanase (Papers of Editor's Choice)
J. Phys. Soc. Jpn. 82, 074714 (2013).

"Spin-triplet pairing state of Sr₂RuO₄ in the c-axis magnetic field",
S. Takamatsu and Y. Yanase
J. Phys. Soc. Jpn. 82, 063706 (2013).

"Locally Non-centrosymmetric Superconductivity in Multi-layer Systems",
D. Maruyama, M. Sigrist, and Y. Yanase
J. Phys. Soc. Jpn. 81, 034702 (2012).

"Antiferromagnetic Order and π-Triplet Pairing in the Fulde-Ferrell-Larkin-Ovchinnikov State",
Y. Yanase and M. Sigrist
J. Phys. Soc. Jpn. 78,114715 (2009). (Papers of Editor's Choice)

"Localization and Superconductivity in Doped Semiconductors",
Y. Yanase and N. Yorozu
J. Phys. Soc. Jpn. 78, 034715 (2009).

"Non-centrosymmetric Superconductivity and Antiferromagnetic Order: Microscopic discussion of CePt₃Si",
Y. Yanase and M. Sigrist
J. Phys. Soc. Jpn. 76, 043712 (2007).

"Microscopic Identification of the D-vector in Triplet Superconductor Sr₂RuO₄",
Y. Yanase and M. Ogata
J. Phys. Soc. Jpn. 72, 673-687 (2003).

"Theory of Superconductivity in Strongly Correlated Electron Systems",
Y. Yanase, T. Jujo, T. Nomura, H. Ikeda, T. Hotta and K. Yamada
Physics Reports 387, 1-149 (2003).