Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 65: Quantum-Critical Phenomena II

TT 65.1: Vortrag

Mittwoch, 14. März 2018, 15:00–15:15, HFT-FT 131

Nematic phase transition of Dirac fermions — •Jonas Schwab¹, Kai Sun², Zi Yang Meng³, Igor Herbut⁴, and Fakher F. Assaad¹ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — ²Physics Department, University of Michigan, Ann Arbor, MI 48109, USA — ³Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China — ⁴Department 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. The model is amenable to sign-problem free quantum Monte Carlo simulations such that the nature of the transition for various couplings and flavor number of Dirac fermions can be analyzed in detail.