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理論セミナー:Quantum transport by time-dependent perturbation

日程 : 2015年1月30日(金) 16:00 - 17:00 場所 : 物性研究所本館6階 第5セミナー室 (A615) 講師 : 都倉 康弘 氏 所属 : 筑波大学大学院数理物質科学研究科 世話人 : 加藤 岳生 (63255)
e-mail: kato@issp.u-tokyo.ac.jp

Linear response theory often starts discussing the effect of time-dependent perturbations with frequency omega and then takes the zero-frequency limit to obtain intrinsic properties of many-body system, which is in principle equivalent to fluctuation-dissipation theorem. When we modulate more than one parameters, there appears a new time-dependent transport, called pumped transport. Recently, a lot of interests are focused to the lowest-order non-adiabatic correction to the pumped transport in a static (adiabatic) limit, possibly because this can be a controlled system that can tackle the problem of non-equilibrium statistical physics. Both in classical and quantum setups, this contribution had shown to have a topological character, being expressed by a surface integral of a “Berry” curvature. In this presentation, I review recent activities of this field and show our approach based on generalized quantum master equation. Finally, I explain our quantum transport results in quantum dot system coupled two leads, with time-dependent modulation of a tunneling phase and magnetic fields.


(公開日: 2015年01月13日)