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TT: Fachverband Tiefe Temperaturen
TT 56: Correlated Electrons: Quantum-Critical Phenomena
TT 56.10: Vortrag
Donnerstag, 19. März 2020, 12:00–12:15, HSZ 304
Nematic phase transitions of Dirac fermions — •Jonas Schwab1, Lukas Janssen2, Kai Sun3, Zi Yang Meng4, Igor Herbut5, and Fakher F. Assaad1 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany — 2Institut für Theoretische Physik, Technische Universität Dresden, Germany — 3Physics Department, University of Michigan, Ann Arbor, MI 48109, USA — 4Institute of Physics, Chinese Academy of Sciences, Beijing 100190,China — 5Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
We consider Dirac fermions, as realized by a pi-flux tight binding model on a square lattice, coupled to an Ising model in a transverse field. The coupling is chosen such that the ordering of the Ising spins triggers a meandering of the Dirac fermions and thereby a nematic deformation of the “Fermi” surface. We consider two models where the nematic transition reduces the initial C4V (C2V) symmetry to C2V (2V). Auxiliary field quantum Monte Carlo simulations reveal that the C4V (C2V) symmetric model show a continuous (first order) transition. An analytical understanding of the transition is derived.