Physics (Internal)

Quantum Coulomb glass on the Bethe lattice

This event is part of the Biophysics/Condensed Matter Seminar Series.

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 limit of infinite coordination number. By combining continuous time quantum Monte-Carlo simulations with self-consistent diagrammatic perturbation theory, we find that 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 obtain the complete phase diagram of the electron glass, and characterize its dynamical properties in the replica symmetric quantum liquid phase, as well as in the glassy phase in the presence of full replica symmetry breaking. The spectral function displays 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.

https://bostonu.zoom.us/j/98731662171?pwd=VGVvSEZLZUlRa0xNbUgvWGh6THA3Zz09