Hideo Aoki

Iron-based superconductor

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Outline

Our main interests are many-body and topological effects in electron systems, i.e.,
superconductivity,
magnetism,
topological systems (including graphene)


For these system we explore
materials design for correlated electron systems, and
non-equilibrium phenomena

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What's New

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2016.06.24
A party in honour Aoki in his retirement was held at Tokyo Kaikan (Otemachi) on 18 June 2016.
2016.06.22
"International Symposium on New Horizons in Condensed Matter Physics" (Sat 18 - Sun 19 June 2016) http://fpmrt.riken.jp/public_html/aoki.symposium/index.html
has been held at Koshiba Hall, University of Tokyo (Hongo campus). Invited talks were given by Jun Akimitsu, Hideo Aoki, Ryotaro Arita, F. D. M. Haldane, Koji Hashimoto, Karsten Held, Kazuhiko Kuroki, Peter Maksym, Hiroshi Ooguri, Ryo Shimano, Yoshiro Takahashi and Philipp Werner .
2016.04.04
Prof. Hideo Aoki has retired from the Department of Physics, University of Tokyo in March 2016. He continues his research with external funds at

Department of Physics,
University of Tokyo,
Hongo, Tokyo 113-0033, Japan

and at

Electronics and Photonics Research Institute,
Advanced Industrial Science and Technology (AIST),
Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan.
2016.03.11
Prof. Hideo Aoki is retiring from the Department of Physics, University of Tokyo in March 2016 at the age of 65. He is giving a final lecture entitled
"Renaissance in the condensed-matter physics --- superconductivity, topological systems and nonequilibrium"
in Koshiba Hall on 10 March 2016.
Contents
2015.07.31
A paper by Kitamura, Tsuji and Aoki that designed a topological Mott insulator (where a fermion system spontaneously becomes a topological insulator due to interactions) for cold-atom systems in optical lattices with a confirmation by a first-principles method for cold-atom systems extended to non-collinear spin structures [Sota Kitamura, Naoto Tsuji and Hideo Aoki: An interaction-driven topological insulator in fermionic cold atoms on an optical lattice --- A design with a density functional formalism (arXiv:1411.3345)] is now published in Phys. Rev. Lett. 115, 045304 (2015).
2015.05.01
Dr Shintaro Takayoshi joined the group as a reseach associate.
2015.04.03
Dr Naoto Tsuji, the research associate in the group, has moved to the Center for Emergent Matter Science, RIKEN, from April 2015.
2015.01.29
A review on the iron-based superconductors by Aoki and Prof. Hosono (Tokyo Institute of Technology) is published in "Physics World" [Hideo Aoki and Hideo Hosono: A superconducting surprise comes of age, Physics World, Feb. 2015, p.31].
2014.12.04
"Floquet topological insulator" (an emergence of a quantum Hall effect in zero external magnetic field in a honeycomb lattice illuminated by a circularly-polarised light), which has been predicted by Takashi Oka and Hideo Aoki [Phys. Rev. B 79, 081406(R) (2009)], is now demonstrated experimentally in a cold-atom system on a honeycomb optical lattice by Esslinger's group in ETH Zurich [G. Jotzu et al, Nature 515, 237 (2014)].
2014.11.26
Our paper that theoretically indicated the existence of a supersolid phase in an electron-phonon system [Yuta Murakami, Philipp Werner, Naoto Tsuji and Hideo Aoki: Supersolid phase accompanied by a quantum critical point in the intermediate coupling regime of the Holstein model (arXiv:1402.6456)] has been accepted for publication in Phys. Rev. Lett.
2014.10.07
Our theoretical paper on the iron pnictides [K. Kuroki, S. Onari, R. Arita, H. Usui, Y. Tanaka, H. Kontani and H. Aoki: Unconventional superconductivity originating from disconnected Fermi surfaces in LaO1-xFxFeAs, Phys. Rev. Lett. 101, 087004 (2008)] has now been cited more than 900 times.
2014.09.08
A strong THz laser light is shown to induce oscillations of the superconducting order parameter in NbN with twice the frequency of the THz field in an experiment done by Professor Shimano's group in our department. The result is theoretically captured as a collective precession of Anderson's pseudospins in ac driving fields. Specifically, a resonance between the field and the Higgs amplitude mode of the superconductor is shown, both experimentally and theoretically, to induce large THz third-harmonic generation. The experiment-theory joint paper is now published on 5 September in Science 345, 1145 (2014).
2014.07.12
A strong THz laser light is shown to induce oscillations of the superconducting order parameter in NbN with twice the frequency of the THz field in an experiment done by Professor Shimano's group in our department. The result is theoretically captured as a collective precession of Anderson’s pseudospins in ac driving fields. Specifically, a resonance between the field and the Higgs amplitude mode of the superconductor is shown, both experimentally and theoretically, to induce large THz third-harmonic generation. The experiment-theory joint paper is now published in Science Express, 10 July 2014 issue.
2014.06.26
A review article, Hideo Aoki, Naoto Tsuji, Martin Eckstein, Marcus Kollar, Takashi Oka and Philipp Werner: Nonequilibrium dynamical mean-field theory and its applications (arXiv:1310.5329), is now published in Reviews of Modern Physics 86, 779 (2014)

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