Lifetimes of local excitations in disordered dipolar quantum systems
- URL: http://arxiv.org/abs/2102.01705v1
- Date: Tue, 2 Feb 2021 19:00:02 GMT
- Title: Lifetimes of local excitations in disordered dipolar quantum systems
- Authors: Rahul Nandkishore and Sarang Gopalakrishnan
- Abstract summary: When a strongly disordered system of interacting quantum dipoles is locally excited, the excitation relaxes on some (potentially very long) timescale.
We analyze this relaxation process, both for electron glasses with strong Coulomb interactions.
A rich set of scaling laws is found.
- Score: 0.6445605125467573
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: When a strongly disordered system of interacting quantum dipoles is locally
excited, the excitation relaxes on some (potentially very long) timescale. We
analyze this relaxation process, both for electron glasses with strong Coulomb
interactions - in which particle-hole dipoles are emergent excitations - and
for systems (e.g., quantum magnets or ultracold dipolar molecules) made up of
microscopic dipoles. We consider both energy relaxation rates ($T_1$ times) and
dephasing rates ($T_2$ times), and their dependence on frequency, temperature,
and polarization. Systems in both two and three dimensions are considered,
along with the dimensional crossover in quasi-two dimensional geometries. A
rich set of scaling laws is found.
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