2024/01/05 by Adam Eaton, Eaton, Adam, Dibya Kanti Mukherjee +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2401.03013
openalex publication_date 2024/01/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Lifshitz transitions are topological transitions of a Fermi surface, whose signatures typically appear in the conduction properties of a host metal. Here, we demonstrate, using an extended Falicov- Kimball model of a two-flavor fermion system, that a Lifshitz transition which occurs in the noninteracting limit impacts interaction-induced insulating phases, even though they do not host Fermi surfaces. For strong interactions we find a first order transition between states of different polarization This transition line ends in a very unusual quantum critical endpoint, whose presence is stabilized by the onset of inter-flavor coherence. We demonstrate that the surfaces of maximum coherence in these states reflect the distinct Fermi surface topologies of the states separated by the non-interacting Lifshitz transition. The phenomenon is shown to be independent of the band topologies involved. Experimental realizations of our results are discussed for both electronic and optical lattice systems.