Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
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.