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Ultracold atoms in periodically modulated optical potentials: A quantum metamaterial to explore nonequilibrium dynamics and tosimulate relativistic effect

周期性调制光势中的超冷原子：探索非平衡动力学和模拟相对论效应的量子超材料

基本信息

批准号：
231556095
负责人：
Professor Dr. Sergey Denisov, Ph.D.
金额：
--
依托单位：
Institut für Angewandte Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/231556095?language=en
关键词：
Ultracold atoms periodically modulated optical

项目摘要

The main objective of this joint experiment-theory project is to study ac-driven ultracold atomic gases towards the goal of developing a new testing-ground for non-equilibrium quantum dynamics and relativistic physics effects. To reach this goal we will perform both theoretical studies, by using the quantum Floquet formalism and high-performance computing, and experiments with ultra-cold atomic gases in temporally modulated optical lattice potentials.The project is subdivided into two consecutive steps. Starting out we will focus on the non-equilibrium quantum regime of ac-driven optical lattice potentials. The specific questions we want to address are (i) transport resonances induced by avoided crossings between different Floquet states and (ii) uantum many-body effects on the atom transport in the limit of strong interparticle interactions and strong driving. The next step is to study ac-driven optical potentials as tunable quantum “metamaterials”. The key idea is to create Dirac cones in the quasienergy spectrum of a periodically-modulated quantum system through controllable avoided crossings between designated Floquet tates. To test the physics that follows from these Dirac cones we plan to carry out an experimental quantum simulation of relativistic Klein tunneling and also Veselago lensing with a cloud of ultracold atoms placed in driven optical potentials. Among possible applications of our anticipated outcomes are new Floquet-state based quantum tools, whose operational principles will rely on non-equilibrium physics and can be used to carry out quantum simulations of the relativistic manybody wave equation.

该联合实验理论项目的主要目标是研究交流驱动的超冷原子气体，以期为非平衡量子动力学和相对论物理效应开发一个新的试验场。为了实现这一目标，我们将利用量子 Floquet 形式和高性能计算进行理论研究，并在时间调制的光学晶格势中进行超冷原子气体实验。该项目分为两个连续的步骤。首先，我们将重点关注交流驱动光学晶格势的非平衡量子态。我们想要解决的具体问题是（i）避免不同 Floquet 态之间的交叉引起的输运共振，以及（ii）在强粒子间相互作用和强驱动的限制下对原子输运的量子多体效应。下一步是研究交流驱动光势作为可调谐量子“超材料”。关键思想是通过指定 Floquet 状态之间的可控避免交叉，在周期性调制量子系统的准能谱中创建狄拉克锥。为了测试这些狄拉克锥体所遵循的物理原理，我们计划对相对论克莱因隧道效应和韦塞拉戈透镜效应进行实验量子模拟，其中超冷原子云置于驱动光势中。我们预期成果的可能应用包括基于 Floquet 态的新型量子工具，其操作原理将依赖于非平衡物理学，可用于进行相对论多体波动方程的量子模拟。