Dynamic Signatures of Non-Hermitian Skin Effect and Topology in Ultracold Atoms,Physical Review Letters

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Dynamic Signatures of Non-Hermitian Skin Effect and Topology in Ultracold Atoms
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-12 , DOI: 10.1103/physrevlett.129.070401
Qian Liang ₁ , Dizhou Xie ₁ , Zhaoli Dong ₁ , Haowei Li _{2,

3} , Hang Li ₁ , Bryce Gadway ₄ , Wei Yi _{2,

3} , Bo Yan ₁

Affiliation

The non-Hermitian skin effect (NHSE), the accumulation of eigen–wave functions at boundaries of open systems, underlies a variety of exotic properties that defy conventional wisdom. While the NHSE and its intriguing impact on band topology and dynamics have been observed in classical or photonic systems, their demonstration in a quantum gas system remains elusive. Here we report the experimental realization of a dissipative Aharonov-Bohm chain—non-Hermitian topological model with NHSE—in the momentum space of a two-component Bose-Einstein condensate. We identify signatures of the NHSE in the condensate dynamics, and perform Bragg spectroscopy to resolve topological edge states against a background of localized bulk states. Our Letter sets the stage for further investigation on the interplay of many-body statistics and interactions with the NHSE, and is a significant step forward in the quantum control and simulation of non-Hermitian physics.

中文翻译：

超冷原子中非厄米集肤效应和拓扑的动态特征

非厄米集肤效应 (NHSE)，即在开放系统边界处的特征波函数的积累，是各种违反传统观念的奇异特性的基础。虽然已经在经典或光子系统中观察到 NHSE 及其对能带拓扑和动力学的有趣影响，但它们在量子气体系统中的演示仍然难以捉摸。在这里，我们报告了耗散 Aharonov-Bohm 链（具有 NHSE 的非厄米拓扑模型）在双分量 Bose-Einstein 凝聚体的动量空间中的实验实现。我们在凝聚态动力学中识别 NHSE 的特征，并执行布拉格光谱以解决局部体态背景下的拓扑边缘态。我们的信函为进一步调查多体统计数据的相互作用以及与 NHSE 的相互作用奠定了基础，

更新日期：2022-08-12

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