Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Poster Session Correlated Electrons 2

TT 47.18: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG

Generic phase diagram of quantum dimer model on square latticeZheng Yan1,2, •Zheng Zhou1, Olav Syljuasen3, Junhao Zhang1, Tianzhong Yuan1, Jie Lou1,4, and Yan Chen1,41Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438, China — 2Department of Physics, The University of Hong Kong, Hong Kong, China — 3Department of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo, Norway — 4Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

Constraint is an important property in low-energy physics, but it also bring a lot of difficulties for numeric calculation. The quantum dimer model is a low-energy description of many spin models, but its phase diagram is still controversial, even on the square lattice. In this article, we focus on the square lattice quantum dimer model and give a unified conclusion about its phase diagram which reconciles conflicting results given in the literature. With our newly developed sweeping cluster method, we studied the phase diagram of the almost full parameter space by introducing the definition of pair correlation function and other supporting evidence to distinguish the mixed phase from the columnar phase with high precision. In particular, we find that the ground state corresponds to the mixed phase for a vast parameter region.

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