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TT: Fachverband Tiefe Temperaturen

TT 56: Correlated Electrons: Quantum-Critical Phenomena

TT 56.9: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 304

Quantum critical behavior of the Hubbard model on the honeycomb lattice — •Francesco Parisen Toldin and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany

We study the quantum critical behavior of the Hubbard model on the honeycomb lattice by means of large-scale projective Auxiliary-field quantum Monte Carlo simulations, which target the ground state of the model. At T=0 the model hosts a continuous phase transition between a Dirac semimetal and an antiferromagnetic Mott insulating phase, whose critical behavior belongs to the Gross-Neveu-Heisenberg universality class, also known as chiral Heisenberg. We investigate the universal properties of the phase transition by a finite-size scaling analysis of time-displaced critical correlation functions.