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arXiv 2002.12912cond-mat.str-elphysics.atom-ph
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关联量子系统中Floquet工程的量子-经典交叉

Quantum to classical crossover of Floquet engineering in correlated quantum systems

Michael A. Sentef, Jiajun Li, Fabian Künzel, Martin Eckstein

摘要:

涉及经典光和量子光的光-物质耦合为调节相关量子材料的电子性质提供了广泛的可能性。两个典型的结果是电子的动力学局域化和自旋动力学的超快控制,这已经在经典Floquet工程和深量子制度中讨论,真空涨落修改材料的性质。在这里,我们讨论这两个极端的限制是如何内插的腔驱动的激发态。特别是,这是通过制定一个Schriffal-Wolff变换的腔耦合系统,这是数学上类似于其Floquet对应。Floquet工程的一些非凡结果,例如交换相互作用或电子隧穿的符号反转,这些结果不是通过耦合到暗腔中获得的,已经可以用单光子态实现(不需要相干态)。数值模拟结果验证和扩展的两个站点的哈伯德模型耦合到驱动腔模式的分析结果。我们的结果推广了完善的Floquet工程的相关电子的制度的量子光。这为高调谐、低能量耗散的量子材料的性能控制开辟了一条新的途径。

英文摘要:

Light-matter coupling involving classical and quantum light offers a wide range of possibilities to tune the electronic properties of correlated quantum materials. Two paradigmatic results are the dynamical localization of electrons and the ultrafast control of spin dynamics, which have been discussed within classical Floquet engineering and in the deep quantum regime where vacuum fluctuations modify the properties of materials. Here we discuss how these two extreme limits are interpolated by a cavity which is driven to the excited states. In particular, this is achieved by formulating a Schrieffer-Wolff transformation for the cavity-coupled system, which is mathematically analogous to its Floquet counterpart. Some of the extraordinary results of Floquet-engineering, such as the sign reversal of the exchange interaction or electronic tunneling, which are not obtained by coupling to a dark cavity, can already be realized with a single-photon state (no coherent states are needed). The analytic results are verified and extended with numerical simulations on a two-site Hubbard model coupled to a driven cavity mode. Our results generalize the well-established Floquet-engineering of correlated electrons to the regime of quantum light. It opens up a new pathway of controlling properties of quantum materials with high tunability and low energy dissipation.

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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