标题： 粒子-空穴激发的相关量子位移矢量 显示英文标题

标题： Correlated quantum shift vector of particle-hole excitations

摘要： 激子是电子相互作用如何影响光学响应和激发的一个典型例子。 我们证明，除了其光谱之外，激子的电子-空穴对的束缚性质产生了一种相关量子几何：激子激发具有一个与光偏振无关的量子位移矢量。 我们发现这种反直觉的行为对几何响应有显著影响：例如，在非中心对称但非极性材料中，垂直激子跃迁具有零位移矢量，从而使其位移光电流为零；这与非相互作用的离域粒子-空穴激发的有限且强烈依赖光偏振的位移矢量形成对比。 这种差异使位移矢量成为粒子-空穴激发对局域化性质的精确诊断工具，并展示了电子相互作用在激发态量子几何响应中的非微扰效应。 显示英文摘要

摘要： Excitons are a prime example of how electron interactions affect optical response and excitation. We demonstrate that, beyond its spectra, the bound nature of an exciton's electron-hole pair produces a correlated quantum geometry: excitonic excitations possess a quantum shift vector that is independent of light polarization. We find this counterintuitive behavior has dramatic consequences for geometric response: e.g., in noncentrosymmetric but non-polar materials, vertical excitonic transitions possess vanishing shift vector zeroing their shift photocurrent; this contrasts with finite and strongly light polarization dependent shift vectors for non-interacting delocalized particle-hole excitations. This dichotomy makes shift vector a sharp diagnostic of the pair localization properties of particle-hole excitations and demonstrates the non-perturbative effects of electron interactions in excited state quantum geometric response.