Publikationsdatum:
2018-09-14
Beschreibung:
Author(s): Xiao Yan Xu, K. T. Law, and Patrick A. Lee Motivated by recent experimental findings of correlating insulator and superconductor behavior in twisted bilayer graphene, the authors study a cluster charge interaction model on a honeycomb lattice. The cluster charge is defined on the dual lattice of honeycomb to mimic charge centers forming a triangular lattice found in experiments. Based on unbiased sign-problem-free quantum Monte Carlo simulations, the authors determine the phase diagram for this model. It features a fermionic quantum critical point with chiral XY universality and a Kekulé valence bond solid phase at intermediate interaction, which may be related to the correlating insulator phase found in experiments. This is an example of the rich phases found in a simple model without artificial design. [Phys. Rev. B 98, 121406(R)] Published Thu Sep 13, 2018
Schlagwort(e):
Surface physics, nanoscale physics, low-dimensional systems
Print ISSN:
1098-0121
Digitale ISSN:
1095-3795
Thema:
Physik
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