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首页> 外文期刊>Physical Review X >Controlled Population of Floquet-Bloch States via Coupling to Bose and Fermi Baths
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Controlled Population of Floquet-Bloch States via Coupling to Bose and Fermi Baths

机译：通过耦合到Bose和Fermi浴来控制Floquet-Bloch状态的种群

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External driving is emerging as a promising tool for exploring new phases in quantum systems. The intrinsically nonequilibrium states that result, however, are challenging to describe and control. We study the steady states of a periodically driven one-dimensional electronic system, including the effects of radiative recombination, electron-phonon interactions, and the coupling to an external fermionic reservoir. Using a kinetic equation for the populations of the Floquet eigenstates, we show that the steady-state distribution can be controlled using the momentum and energy relaxation pathways provided by the coupling to phonon and Fermi reservoirs. In order to utilize the latter, we propose to couple the system and reservoir via an energy filter which suppresses photon-assisted tunneling. Importantly, coupling to these reservoirs yields a steady state resembling a band insulator in the Floquet basis. The system exhibits incompressible behavior, while hosting a small density of excitations. We discuss transport signatures and describe the regimes where insulating behavior is obtained. Our results give promise for realizing Floquet topological insulators.
机译：外部驱动正在成为探索量子系统新阶段的有前途的工具。然而，所产生的内在非平衡状态对于描述和控制具有挑战性。我们研究了周期性驱动的一维电子系统的稳态，包括辐射复合，电子-声子相互作用以及与外部铁离子储层的耦合效应。使用动力学方程的Floquet本征态的人口，我们表明稳态分布可以控制使用声子和费米储层耦合提供的动量和能量松弛途径。为了利用后者，我们建议通过一个能量过滤器将系统和储层耦合，该能量过滤器可以抑制光子辅助隧穿。重要的是，耦合到这些容器会产生一个类似于Floquet基础的带状绝缘子的稳态。该系统表现出不可压缩的行为，同时具有较小的激发密度。我们讨论运输签名并描述获得绝缘行为的状态。我们的结果为实现Floquet拓扑绝缘子提供了希望。

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