Nonordinary Edge Criticality of Two-Dimensional Quantum Critical Magnets

ORAL

Abstract

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.

*FPT is supported by the Deutsche Forschungsgemeinschaft (DFG) through the grant AS/120/13-1 of the FOR1807. SW and LW acknowledge support by the DFG through the grant WE/3649/4-2 of the FOR1807 and through RTG 1995. Furthermore, we thank the IT Center at RWTH Aachen University and the JSC Jülich for access to computing time through JARA-HPC.

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Presenters

  • Lukas Weber

    • Institut für Theoretische Festkörperphysik, RWTH Aachen University

Authors

  • Lukas Weber

    • Institut für Theoretische Festkörperphysik, RWTH Aachen University

  • Francesco Parisen Toldin

    • Institut für Theoretische Physik und Astrophysik, Universität Würzburg
    • Institute for Theoretical Physics and Astrophysics, University of Würzburg

  • Stefan Wessel

    • Institut für Theoretische Festkörperphysik, RWTH Aachen University
    • RWTH Aachen University
    • Institute for Theoretical Solid State Physics, RWTH Aachen University