Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 56: Correlated Electrons: Quantum-Critical Phenomena
TT 56.7: Talk
Thursday, March 19, 2020, 11:00–11:15, HSZ 304
Nonordinary Edge Criticality of Two-Dimensional Quantum Critical Magnets — Lukas Weber1, Francesco Parisen Toldin2, and •Stefan Wessel1 — 1RWTH Aachen University, Germany — 2Würzburg University, Germany
Based on large-scale quantum Monte Carlo simulations, we examine the correlations along the edges of two-dimensional semi-infinite quantum critical Heisenberg spin-1/2 and spin-1 systems. In particular, we consider coupled quantum spin-dimer systems at their bulk quantum critical points, including the columnar-dimer model and the plaquette-square lattice. The alignment of the edge spins strongly affects these correlations and the corresponding scaling exponents, with remarkably similar values obtained for various quantum spin-dimer systems. We furthermore observe subtle effects on the scaling behavior from perturbing the edge spins that exhibit the genuine quantum nature of these edge states.