自旋非相干莫特-索利斯泵
Spin-incoherent Mott-Thouless pumps
- University of Cologne（科隆大学）
- Weizmann Institute of Science（魏茨曼科学研究所）
- University of California, Santa Barbara（加州大学圣塔芭芭拉分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出工作于高熵自旋非相干莫特态的莫特-索利斯泵，解析证明一类该泵因电荷处于与热自旋解耦的有能隙扇区而具指数保护的量化输运，另一类则因自旋激发产生电荷致输运崩溃，结果获数值模拟支持。
AI中文摘要：
索利斯泵描述的系统中，哈密顿量参数缓慢且周期性变化时，每个周期会输运一个晶格间距的量化电荷。标准情形下，该量化要求系统在整个泵浦过程中保持基态，热力学熵为零。本文引入一类莫特-索利斯泵，其工作于高熵、自旋非相干的莫特态。我们通过解析证明，这些态尽管具有广延熵，却表现出指数保护的量化输运，因为被输运的电荷处于有能隙的扇区，与热自旋自由度动态解耦。相比之下，受近期实验实现的启发，我们识别出另一类缺乏该保护的莫特-索利斯泵：这些系统中，自旋激发可高效产生电荷激发，导致量化输运快速崩溃。我们的解析结果得到了有限系统的数值精确实时模拟支持。
英文摘要：
A Thouless pump describes a system in which a quantized amount of charge is transported by one lattice spacing per cycle when the parameters of a Hamiltonian are varied slowly and periodically. In the standard case, this quantization requires the system to remain in its ground state with vanishing thermodynamic entropy throughout the pumping process. Here, we introduce a class of Mott-Thouless pumps, which operate in highly entropic, spin-incoherent Mott states. We show analytically that these states exhibit exponentially protected quantized transport despite their extensive entropy, because the pumped charge resides in a gapped sector that remains dynamically decoupled from the hot spin degrees of freedom. By contrast, motivated by a recent experimental realization, we identify other classes of Mott-Thouless pumps that lack this protection. In these systems, spin excitations can efficiently generate charge excitations, leading to a rapid breakdown of quantized transport. Our analytical results are supported by numerically exact real-time simulations of finite systems.
