论文标题
轻型固体中的浮动动力学
Floquet dynamics in light-driven solids
论文作者
论文摘要
我们通过捕获环境对电子的影响来展示光诱导的电子浮部态在固体中的性质如何影响天然的物理可观察物，例如传输特性。我们将环境包括为耗散过程，例如频带衰减和倾向，通常在floquet预测中被忽略。这些耗散过程通过平衡光学驱动力来确定新兴稳态的浮球频带职业。为了基准并说明我们在逼真的固体中的浮雕物理框架，我们考虑了J.〜W。〜Mciver等人最近报道的石墨烯中光引起的霍尔电导率，《自然物理学》（2020年）。我们表明，除了平均带速度给出的动力学贡献外，霍尔电导率是由光引起的浮子带的占用状态的浆果通量估算的。因此，Floquet理论将该霍尔电导率解释为几何作用。我们在主方程形式主义中证明了这种机制，并与实验测量的霍尔电导率获得了良好的定量一致性，强调了这种方法的有效性，该方法为理解固体中的超快非平衡动力学建立了广泛适用的框架。
We demonstrate how the properties of light-induced electronic Floquet states in solids impact natural physical observables, such as transport properties, by capturing the environmental influence on the electrons. We include the environment as dissipative processes, such as inter-band decay and dephasing, often ignored in Floquet predictions. These dissipative processes determine the Floquet band occupations of the emergent steady state, by balancing out the optical driving force. In order to benchmark and illustrate our framework for Floquet physics in a realistic solid, we consider the light-induced Hall conductivity in graphene recently reported by J.~W.~McIver, et al., Nature Physics (2020). We show that the Hall conductivity is estimated by the Berry flux of the occupied states of the light-induced Floquet bands, in addition to the kinetic contribution given by the average band velocity. Hence, Floquet theory provides an interpretation of this Hall conductivity as a geometric-dissipative effect. We demonstrate this mechanism within a master equation formalism, and obtain good quantitative agreement with the experimentally measured Hall conductivity, underscoring the validity of this approach which establishes a broadly applicable framework for the understanding of ultrafast non-equilibrium dynamics in solids.
