In solids, a huge number of electrons interact with one another through Coulomb repulsion, and the correlation effects induced by the interaction can lead to various interesting phenomena. One such effect is unconventional superconductivity ; while the Cooper pairing interaction in superconductors is usually mediated by phonons, the electron correlation effects can also be the origin of the pairing interaction, which can give rise to high Tc and/or unconventional pairing symmetries. I am particularly interested in unconventional superconductivity that is considered to be realized in high Tc materials such as the cuprates and the iron pnictides, and also in organic conductors. Applying many-body theory to model Hamiltonians that take into account the realistic band structure, we provide theoretical understanding of the experimental observations, and also intend to make predictions.
1. Electron correlation and unconventional superconductivity
2. Optimization of thermoelectric effects in correlated systems
K. Kuroki, T. Kimura and H. Aoki: Quantum Monte Carlo study of the pairing correlation in the Hubbard ladder, Phys. Rev. B 54 (1996) R15641-15644 (Rapid Communications).
K. Kuroki and R. Arita: Possible high-T_c superconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets, Phys. Rev. B 64 (2001) 024501-(1-4).
K. Kuroki and R. Arita: "Pudding mold" band drives large thermopower in NaxCoO2, J. Phys. Soc. Jpn. 76 (2007) 083707； selected as "Papers of Editors' Choice" in JPSJ.
K. Kuroki, S. Onari, R.Arita, H.Usui, Y. Tanaka, H. Kontani, and H. Aoki : Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO_1-xF_x, Phys. Rev. Lett. 101 (2008) 087004.
K. Kuroki, H. Usui, S. Onari, R. Arita, and H. Aoki : Pnictogen height as a possible swtich between high Tc nodeless and low Tc nodal pairings in the iron based superconductors, Phys. Rev. B 79 (2009) 224511, selected as Editors' Suggestion.
H. Sakakibara, H. Usui, K. Kuroki, R. Arita, and H. Aoki : Two-orbital model explains the higher transition temperature of the single-layer Hg-cuprate superconductor compared to that of the La-cuprate superconductor, Phys. Rev. Lett. 105 (2010) 057003(1-4).
Research Associate, Department of Physics, The University of Tokyo
Ph.D in Physics, The University of Tokyo
Associate Professor, Department of Applied Physics and Chemistry, The University of Electro-communications
Professor, Department of Applied Physics and Chemistry, The University of Electro-communications
Professor, Department of Physics , Osaka University