Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Abstract

Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition -- so-called Lifshitz transition -- in the regime accessible to present-day experiments. We describe the impact of the Lifshitz transition on observable quantities such as the Fermi surface topology, the density-density correlation function, and the excitation spectrum of the system. The Lifshitz transition in ultracold atoms can be controlled by tuning the dipole orientation and -- in contrast to the transition studied in crystalline solids -- is completely interaction-driven.

5 pages, 5 figures + 2 appendices

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Cited by in corpus (5)

• Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
• Dipolar physics: A review of experiments with magnetic quantum gases
• Coexistence of Nematic Order and Superconductivity in the Hubbard Model
• Ground state of an ultracold Fermi gas of tilted dipoles in elongated traps
• A ship-in-a-bottle quantum gas microscope setup for magnetic mixtures