Dear All, I’m forwarding the seminar announcement on June 28.
For the zoom link, please send an e-mail to Tsuji san at
tsuji@phys.s.u-tokyo.ac.jp <mailto:tsuji@phys.s.u-tokyo.ac.jp>
best, Naomichi Hatano
>
> Dear all,
>
> We will have a statphys seminar given by Dr. Yuta Murakami at 10 am, June 28 (Mon).
>
>
> Best regards,
> Naoto Tsuji
>
> ———————————————————————————–
> Speaker: Dr. Yuta Murakami (Tokyo Institute of Technology)
> Date: June 28 (Mon) 2021, 10:00 – 11:00
>
> Title: Nonthermal orders in strongly correlated systems
>
> Abstract:
> One of the major goals in nonequilibrium condensed matter physics is to control or induce ordered phases by exciting matters.
> In particular, strongly correlated systems is an attracting playground to this direction.
> In this talk, we discuss two ideas about how to realize nonthermal orders in strongly correlated systems.
> The first idea is to use the prethermal regime before the scatterings set in [1].
> In this regime, the information of the initial state is kept so that the system can remain cold in a certain sense even after the excitation.
> We demonstrate that this concept can be used to induce a nonthermal excictonic order in a multi-orbital Hubbard model.
> The second idea is to use a possible bottleneck in the relaxation process in Mott insulators.
> By exciting Mott insulators, one induces pseudoparticles that are absent in equilibrium.
> These pseudoparticles may have long lifetime due to a large Mott gap (bottleneck), which leads the system to approach a nonequilibrium steady state.
> By introducing a generalized Gibbs ensemble type description for strongly correlated systems, we studied the photo-doped one-dimensional extended Hubbard model [2].
> We determined the nonequilibrium phase digram of this model, where the eta-pairing phase, spin density wave and charge density wave compete or coexist.
> We reveal the properties of these nonequilibrium phases and clarify unique features compared to chemically doped states in equilibrium.
> We also discuss the relation between these nonthermal orders in strongly correlated systems and those in photo-excited semiconductors, which have been discussed for decades.
>
> [1] P. Werner and Y. Murakami, Phys. Rev. B 102 241103(R) (2020).
> [2] Y. Murakami, S. Takayoshi, T. Kaneko, Z. Sun, D. Golež, A. J. Millis and P. Werner, arXiv:2105.13560.
>
> —
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Naomichi Hatano
Institute of Industrial Science, University of Tokyo
Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8574, JAPAN
Phone: +81-4-7136-6961
Fax: +81-4-7136-6978
hatano-lab.iis.u-tokyo.ac.jp/hatano/
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