Summary of group activities in 2012

Theoretical condensed-matter physics
Hideo Aoki, Takashi Oka (- May 2012), Naoto Tsuji (Oct 2012-)

Our main interests are many-body and topological effects in electron systems, i.e., superconductivity, magnetism and topological phenomena, for which we envisage a materials design for correlated electron systems and novel non-equilibrium phenomena should be realised. Studies in the 2012 academic year include:


         - High-Tc cuprates: material- and pressure-dependence [2]

         - Multi-layer high-Tc cuprates [3]

         - Organic and carbon-based superconductors [4,5]

         - Superconductivity induced in non-equilibrium:

               Dynamical repulsion-attraction conversion in intense ac fields [6]

Topological systems

        - Spin Hall effect in the iron-based superconductors [7]

        - Graphene quantum Hall system and the chiral symmetry[8-10]

        - Optica (THz) quantum Hall effect in the 2D electron gas and in graphene [11]

        - Graphene quantum dot [12]

        - Fractional quantum Hall effect in oxides [13]

        - Zeolite-templated carbon [14]

Non-equilibrium phenomena

        - Dielectric breakdown of Mott insulators[15]

        - Dynamical phase transitions in correlated electron systems

        - Dicke transition in solids placed in an optical cavity

        - Nonequilibrium quantum spin systems[16]

[1] Hideo Aoki, J. Superconductivity and Novel Magnetism 25, 1243 (2012).

[2] H. Sakakibara, H. Usui, K. Kuroki, R. Arita and H. Aoki, Phys. Rev. B 85, 064501 (2012) (Editor's Suggestion); H. Sakakibara et al, Phys. Rev. B 86, 134520 (2012).

[3] K. Nishiguchi, K. Kazuhiko, R. Arita, T. Oka, and H. Aoki, arXiv:1212.6320.

[4] Takashi Kambe et al, Phys. Rev. B 86, 214507 (2012) (Editors' Suggestion).

[5] Q. Xin et al, Phys. Rev. Lett. 108, 226401 (2012).

[6] N. Tsuji, T. Oka, H. Aoki and P. Werner, Phys. Rev. B 85, 155124 (2012).

[7] S. Pandey, H. Kontani, D.S. Hirashima, R. Arita and H. Aoki, Phys. Rev. B 86, 060507(R) (2012).

[8] T. Kawarabayashi, Y. Hatsugai, T. Morimoto and H. Aoki, Phys. Rev. B 85, 165410 (2012).

[9] T. Morimoto and H. Aoki, Phys. Rev. B 85, 165445 (2012).

[10] Y. Hatsugai, T. Morimoto, T. Kawarabayashi, Y. Hamamoto and H. Aoki, New J. Phys. 15, 035023 (2013).

[11] R. Shimano, G. Yumoto, J. Y. Yoo, R. Matsunaga, S. Tanabe, H. Hibino, T. Morimoto and H. Aoki, Nature Commun., to be published.

[12] P.A. Maksym and H. Aoki, arXiv:1211.5552.

[13] D. Maryenko, J. Falson, Y. Kozuka, A. Tsukazaki, M. Onoda, H. Aoki and M. Kawasaki, Phys. Rev. Lett. 108, 186803 (2012).

[14] Takashi Koretsune, Ryotaro Arita and Hideo Aoki, Phys. Rev. B 86, 125207 (2012).

[15] Takashi Oka, Phys. Rev. B 86, 075148 (2012).

[16] Shintaro Takayoshi, Hideo Aoki and Takashi Oka, in quantum magnets, arXiv:1302.4460.

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