Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Correlated Electrons: Frustrated Magnets - General 1

TT 12.11: Vortrag

Montag, 20. März 2017, 18:00–18:15, HSZ 03

Quantum Monte-Carlo study of hardcore bosons on a kagome lattice — •Xue-Feng Zhang¹, Yin-Chen He², Sebastian Eggert³, Roderich Moessner¹, and Frank Pollmann¹ — ¹Max-Planck- Institute for the Physics of Complex Systems, 01187 Dresden, Germany — ²Department of Physics, Harvard University, Cambridge, MA 02138, USA — ³Physics Department and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany

We study an extended Hubbard model of hardcore bosons on the kagome lattice. In the limit of strong nearest-neighbor interactions at one-third filling, the interplay between frustration and quantum fluctuation is know to form a valence bond solid. When decreasing the interaction strength, the system has a transition to a superfluid phase. The precise nature of this phase transition is still under debate. Two possibilities are that it could be a weakly first order or an unconventional continuous phase transition. We revisit this problem using large scale quantum Monte Carlo simulation with parallel tempering. We find a first order phase transition away from the tip of the one third filling lobe, while it appears to be continuous at exactly one third filling. A careful finite size scaling analysis reveals an unconventional scaling behavior hinting at deconfined quantum criticality.