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arXiv 2103.15923quant-phcond-mat.othermath-phmath.MP
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李代数量子系统的Floquet工程

Floquet Engineering of Lie Algebraic Quantum Systems

Jayendra N. Bandyopadhyay, Juzar Thingna

摘要:

我们提出了一个“Floquet工程”的形式主义系统地设计一个周期性的驱动协议,以频闪实现所需的系统从一个给定的静态哈密顿量。该方法适用于具有封闭Lie代数结构的量子系统,例如,具有非相互作用粒子在晶格上运动的固态系统,或者由超冷原子在光晶格上运动所描述的超冷原子在晶格上运动的固态系统。与以前的尝试在Floquet工程,我们的方法产生所需的Floquet哈密顿在任何驱动频率,并不限于快速或慢速驾驶制度。该方法是基于Wei-Norman的anximation,这是最初提出的任何任意驾驶构造一个时间演化算子。在这里,我们将此模型应用于微运动动力学,定义在一个周期内的驱动,并获得驱动协议,通过固定的规格的微运动。为了说明我们的想法,我们使用一个两带系统或由两个子晶格组成的系统作为测试床。特别是,我们专注于工程的交叉缝合晶格模型,一直是一个典范的平带模型。

英文摘要:

We propose a `Floquet engineering' formalism to systematically design a periodic driving protocol in order to stroboscopically realize the desired system starting from a given static Hamiltonian. The formalism is applicable to quantum systems which have an underlying closed Lie-algebraic structure, for example, solid-state systems with noninteracting particles moving on a lattice or its variant described by the ultra-cold atoms moving on an optical lattice. Unlike previous attempts at Floquet engineering, our method produces the desired Floquet Hamiltonian at any driving frequency and is not restricted to the fast or slow driving regimes. The approach is based on Wei-Norman ansatz, which was originally proposed to construct a time-evolution operator for any arbitrary driving. Here, we apply this ansatz to the micro-motion dynamics, defined within one period of the driving, and obtain the driving protocol by fixing the gauge of the micro-motion. To illustrate our idea, we use a two-band system or the systems consisting of two sub-lattices as a testbed. Particularly, we focus on engineering the cross-stitched lattice model that has been a paradigmatic flat-band model.

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