Lifetimes of local excitations in disordered dipolar quantum systems

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.

References in corpus (10)

• Many body localization and thermalization in quantum statistical mechanics
• How a small quantum bath can thermalize long localized chains
• Interferometric probes of many-body localization
• Depolarization dynamics in a strongly interacting solid-state spin ensemble
• Many-Body Delocalization in Strongly Disordered System with Long-Range Interactions: Finite Size Scaling
• Many body localization with long range interactions
• Instability of many-body localized systems as a phase transition in a nonstandard thermodynamic limit
• Ferromagnet in a continuously tuneable random field
• Marginal Anderson localization and many body delocalization
• Quantum spin liquids and the metal-insulator transition in doped semiconductors