Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Quantum-Critical Phenomena
TT 24.3: Vortrag
Mittwoch, 7. September 2022, 15:30–15:45, H23
Deconfined multi-critical point — •Zhenjiu Wang1 and Adam Nahum2 — 1Max-Planck Institute for the Physics of Complex Systems, D-01187, Dresden, Germany — 2Laboratoire de Physique, Ecole Normale Superieure, CNRS, Universit*e PSL, * Sorbonne Universite, Universite de Paris, 75005 Paris, France
We numerically investigate a deconfined quantum critical point (DQCP) that happens between Neel and valence bond solid phase in a 3-dimensional loop model. Amazingly, this DQCP is an Liftshitz tricritical point due to an explicit lattice symmetry breaking term. This perturbation breaks lattice translational symmetry as well as a mirror-reflection symmetry whereas production of these two operations leave system invariant, hence only an additional vector potential term is coupled to the non-linear sigma model in IR theory. A helical valence bond solid state with spatially modulated valence bond order parameter separates VBS and Neel state due to this explicit vector potential, and a continuous phase transition between Neel and HVB state is simply described by the criticality of DQCP with an emergent Lorenz invariance in IR limit.