Probing localization and quantum geometry by spectroscopy
Abstract
The spatial localization of quantum states plays a central role in condensed-matter phenomena, ranging from many-body localization to topological matter. Building on the dissipation-fluctuation theorem, we propose that the localization properties of a quantum-engineered system can be probed by spectroscopy, namely, by measuring its excitation rate upon a periodic drive. We apply this method to various examples that are of direct experimental relevance in ultracold atomic gases, including Anderson localization, topological edge modes, and interacting particles in a harmonic trap. Moreover, inspired by a relation between quantum fluctuations and the quantum metric, we describe how our scheme can be generalized in view of extracting the full quantum-geometric tensor of many-body systems. Our approach opens an avenue for probing localization, as well as quantum fluctuations, geometry and entanglement, in synthetic quantum matter.
Cite
@article{arxiv.1904.11764,
title = {Probing localization and quantum geometry by spectroscopy},
author = {Tomoki Ozawa and Nathan Goldman},
journal= {arXiv preprint arXiv:1904.11764},
year = {2019}
}
Comments
7 + 2 pages, 4 figures. Published version