Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Frustrated Magnets - General 2 (joint session TT/MA)

TT 33.3: Vortrag

Dienstag, 2. April 2019, 14:30–14:45, Theater

Quantum Monte-Carlo simulation of SU(2N) Spin systems — •Jonas Schwab, Francesco Parisen Toldin, and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany

We consider the spin-S, SU(2N) Heisenberg model corresponding to the irreducible representation of SU(2N) consisting of a Young tableau of N rows and 2S columns. In the large-S limit the spin wave approximation leads to spin ordering, whereas in the large-N limit a saddle point approximation favors dimerization. We show that this generalized SU(2N) spin model can be solved with sign-problem free determinantal quantum Monte-Carlo methods on any bipartite lattice so that the phase diagram in the S versus N plane can in principle be mapped out.