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arXiv 2403.07052cond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
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绝缘体的即时响应与量子几何

Instantaneous response and quantum geometry of insulators

Columbia University(哥伦比亚大学);Flatiron Institute(平顿研究所)

Nishchhal Verma, Raquel Queiroz

AI总结:

本文提出时间依赖量子几何张量,用于研究绝缘体的即时响应特性,包括光学质量、轨道角动量和介电常数,并通过几何受阻平带实现频谱权重转移。

摘要:

我们提出了时间依赖的量子几何张量(tQGT)作为捕捉绝缘体几何特征的综合性工具,可在线性响应范围内观测到。我们展示tQGT描述了束缚电子的零点运动,并作为电子电导通用求和规则的生成函数。因此,它为计算绝缘体的即时响应提供了系统框架,包括光学质量、轨道角动量和介电常数。该构造保证了在限制占据和未占据状态数量的低能描述中,这些量的近似一致性。我们概述了如何通过晶格干涉在周期系统中生成量子几何,并通过创建几何上受阻的平带将频谱权重从低频转移到高频。

英文摘要:

We present the time-dependent Quantum Geometric Tensor (tQGT) as a comprehensive tool for capturing the geometric character of insulators observable within linear response. We show that tQGT describes the zero-point motion of bound electrons and acts as a generating function for generalized sum rules of electronic conductivity. It therefore enables a systematic framework for computing the instantaneous response of insulators, including optical mass, orbital angular momentum, and dielectric constant. This construction guarantees a consistent approximation across these quantities upon restricting the number of occupied and unoccupied states in a low-energy description of an infinite quantum system. We outline how quantum geometry can be generated in periodic systems by lattice interference and examine spectral weight transfer from small frequencies to high frequencies by creating geometrically frustrated flat bands.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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