2021/04/30 by Jaksa Vucicevic, Jakša Vučičević, Rok Žitko +1 · 15 citations
Materials Science · Physics and Astronomy · #Brillouin zone #Conductivity #Cyclotron #Electron #Graphene research and applications #Hubbard model #Magnetic field #Mean field theory #Organic and Molecular Conductors Research #Quasiparticle #Strongly correlated material #Topological Materials and Phenomena #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.127.196601
published in Physical Review Letters 127(19), 196601 (American Physical Society) · 6 pages, 3 figures
arxiv created 2021/08/13 · openalex publication_date 2021/11/02 · openalex created_date 2021/11/08 · arxiv updated 2021/11/17 · openalex updated_date 2026/08/05
Using the dynamical mean field theory we investigate the magnetic field dependence of dc conductivity in the Hubbard model on the square lattice, fully taking into account the orbital effects of the field introduced via the Peierls substitution. In addition to the conventional Shubnikov-de Haas quantum oscillations, associated with the coherent cyclotron motion of quasiparticles and the presence of a well-defined Fermi surface, we find an additional oscillatory component with a higher frequency that corresponds to the total area of the Brillouin zone. These paradigm-breaking oscillations appear at elevated temperature. This finding is in excellent qualitative agreement with the recent experiments on graphene superlattices. We elucidate the key roles of the off-diagonal elements of the current vertex and the incoherence of electronic states, and explain the trends with respect to temperature and doping.