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arXiv 1502.02664cond-mat.mes-hallcond-mat.mtrl-scicond-mat.quant-gasquant-ph
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通过耦合到玻色和费米池实现Floquet-Bloch态的受控布居

Controlled Population of Floquet-Bloch States via Coupling to Bose and Fermi Baths

Karthik I. Seetharam, Charles-Edouard Bardyn, Netanel H. Lindner, Mark S. Rudner, Gil Refael

摘要:

外部驱动正在成为探索量子系统新阶段的一个有前途的工具。然而,由此产生的本质上的非平衡态很难描述和控制。我们研究了一个周期性驱动的一维电子系统的稳态,包括辐射复合,电子-声子相互作用的影响,耦合到外部费米水库。使用的Floquet本征态的人口的动力学方程,我们表明,稳态分布可以控制使用耦合到声子和费米水库提供的动量和能量弛豫途径。为了利用后者,我们建议通过抑制光子辅助隧穿的能量过滤器耦合系统和水库。重要的是,耦合到这些水库产生一个稳定的状态,类似于一个带绝缘体的Floquet基础。该系统表现出不可压缩的行为,同时托管一个小密度的激发。我们讨论运输签名,并描述了绝缘行为的制度。我们的结果为实现Floquet拓扑绝缘体提供了希望。

英文摘要:

External driving is emerging as a promising tool for exploring new phases in quantum systems. The intrinsically non-equilibrium 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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