非厄米斯塔克局域化浴中的移动杂质动力学
Mobile-impurity dynamics in a non-Hermitian Stark-localised bath
- Institute of Atomic and Molecular Sciences, Academia Sinica（台湾中央研究院原子与分子科学研究所）
- Department of Physics, National Central University（中原大学物理系）
- Physics Division, National Center for Theoretical Sciences（国家理论科学中心物理组）
- Department of Physics, National Taiwan Normal University（台湾师范大学物理系）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究一维非厄米斯塔克局域化浴中移动杂质动力学，发现杂质在中间倾斜强度下局域化，非厄米趋肤效应重塑共振并移动局域化窗口。
AI中文摘要：
我们研究了与受线性斯塔克势以及一维非对称跳跃影响的浴耦合的干净移动杂质的动力学。每当相互作用强度与斯塔克势匹配时，杂质在浴中介导共振隧穿，并导致浴粒子初始状态记忆的丧失。非厄米不对称性不会移动这些共振，但会方向性地重塑它们，并通过非厄米趋肤效应破坏浴的斯塔克诱导记忆。另一方面，我们发现杂质仅在斯塔克势的中间范围内被局域化。在非常弱的倾斜强度下，浴不提供捕获杂质的势能，而在强倾斜下，浴冻结成近乎周期性的电荷密度波，推动杂质向部分局域化发展。与直觉相反，杂质在中间区域局域化，在该区域浴的初始状态记忆被强烈抑制，但空间不均匀的密度分布仍然存在。相互作用放大这些密度涨落，用有效的无序势修饰杂质，从而将其捕获。由于趋肤效应降低了这种中间密度分布，在非厄米区域中，杂质局域化窗口向更强的倾斜方向移动。
英文摘要：
We investigate the dynamics of a clean mobile impurity coupled to a bath subjected to a linear Stark potential as well as asymmetric hopping in one dimension. The impurity mediates resonant tunnelling in the bath whenever the interaction strength matches the Stark potential and leads to loss in the memory of the initial state of the bath particles. The non-Hermitian asymmetry does not shift these resonances but reshapes them directionally, and it destroys the bath's Stark-induced memory through the non-Hermitian skin effect. On the other hand, we find that the impurity is localised only within an intermediate range of Stark potential. At very weak tilt strengths the bath offers no potential to trap the impurity, while at strong tilt the bath freezes into a nearly periodic charge density wave that pushes the impurity towards partial localisation. Counterintuitively, the impurity localises in the intermediate regime where the bath's initial-state memory is strongly suppressed, yet a spatially inhomogeneous density profile persists. The interaction amplifies these density fluctuations, dressing the impurity with an effective disordered potential that traps it. Since the skin effect degrades this intermediate density distribution, the impurity localisation window shifts toward stronger tilt in the non-Hermitian regime.
