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7月10日学术报告:Measurable signatures and preparation of bosonic fractional Chern insulators in optical lattices with ultracold atoms

来源： 发布时间：2024-07-09【字体：大 中 小】

报告人：王波涛 博士后 比利时布鲁塞尔自由大学

会议时间：2024年07月10日（周三） 上午10：00

会议地点：清河路390号 溢智厅

报告内容：

Recent progress in engineering topological band structures in optical lattice systems makes it promising to study fractional quantum Hall physics with ultracold atoms. Here we consider a realistic finite system of a few repulsively interacting bosons on a square lattice with magnetic flux and sharp edges, as it can be realized in quantum-gas microscopes. We investigate under which conditions a fractional Chern insulator state corresponding to the Laughlin-like state at filling \nu=1/2 can be stabilized. Using numerical simulations, we also find clear signatures of excitations with fractional charge in response both to static pinning potentials and dynamical flux insertion. Since the compressible edges, which are found to feature chiral currents, can serve as a reservoir, these observations are robust against various system parameters [1]. Meanwhile, we introduce a new way to prepare an topological states of matter, which is based on dynamically tuning box potentials in a sub-box configuration [2]. The scheme, dubbed "cold-atom elevator", consists in preparing a quantum gas in a box-shaped trap, specifically partitioned so as to connect a system of interest to adjustable atomic reservoirs. By properly lifting the elevator, atoms gently leave the reservoirs, hence building up the target quantum many-body state inside the quantum simulator. Moreover, this setting naturally incorporates a vacuum-cleaning scheme that effectively cools down the prepared quantum state, by repeatedly removing hot particles from the system in a highly-controllable manner. The prime assets of the cold-atom elevator lie in its practical simplicity and universality, which are expected to bring the quantum simulation of strongly-correlated quantum matter to a new level.

报告人简介:

王波涛 博士2022年在德国柏林工业大学获得博士学位，目前在比利时布鲁塞尔自由大学进行博士后研究工作。他的多项研究成果发表在PRL、SciPost Physics等期刊。他的生要研究方向为量子模拟、冷原子中的人工规范场和拓扑、最子气体的动力学性质等。

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