Quantum Coulomb glass on the Bethe lattice
arXiv:2009.02320 · doi:10.1103/PhysRevResearch.4.023067
Abstract
We study the Coulomb glass emerging from the interplay of strong interactions and disorder in a model of spinless fermions on the Bethe lattice. In the infinite coordination number limit, strong interactions induce a metallic Coulomb glass phase with a pseudogap structure at the Fermi energy. Quantum and thermal fluctuations both melt this glass and induce a disordered quantum liquid phase. We combine self-consistent diagrammatic perturbation theory with continuous time quantum Monte-Carlo simulations to obtain the complete phase diagram of the electron glass, and to characterize its dynamical properties in the quantum liquid, as well as in the replica symmetry broken glassy phase. Tunneling spectra display an Efros-Shklovskii pseudogap upon decreasing temperatures, but the density of states remains finite at the Fermi energy due to residual quantum fluctuations. Our results bear relevance to the metallic glass phase observed in Si inversion layers.
16 pages, 13 figures, accepted version
References in corpus (10)
- Many body localization and thermalization in quantum statistical mechanics
- Anderson Transitions
- Hybridization expansion impurity solver: General formulation and application to Kondo lattice and two-orbital models
- Screening and Non-local Correlations in the Extended Hubbard Model from Self-Consistent Combined GW and Dynamical Mean Field Theory
- Mean field theory for the three-dimensional Coulomb glass
- Quantum charge glasses of itinerant fermions with cavity-mediated long-range interactions
- Relaxation dynamics in quantum electron-glasses
- Nonequilibrium Relaxations and Aging Effects in a Two-Dimensional Coulomb Glass
- Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium
- Conductance noise in an out-of-equilibrium two-dimensional electron system