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TT: Fachverband Tiefe Temperaturen

TT 88: Quantum-Critical Phenomena III

TT 88.2: Vortrag

Donnerstag, 15. März 2018, 11:45–12:00, H 3010

Fermion-induced quantum critical points with two length scales — •Emilio Torres¹, Laura Classen², and Michael Scherer¹ — ¹Institute of theoretical Physics, University of Cologne, Germany — ²Physics Department, Brookhaven National Laboratory, NY, USA

The quantum phase transition to a Z3-ordered Kekule phase in two-dimensional Dirac semimetals is governed by a fermion-induced quantum critical point, which renders the putative discontinuous transition continuous. We study the resulting universal, critical behavior in terms of a functional RG approach, which permits to access scaling behavior also on the symmetry-broken side of the phase transition. We show that the fermion-induced criticality leads to a scaling form with two divergent length scales, due to the breaking of the discrete Z3 symmetry. This provides a second source for scaling corrections besides the proximity to the first order transition.