Quantum Monte Carlo Simulations for 2D Moiré Flat Bands
ORAL
Abstract
We report a study about moiré flat bands superconductor by projecting Coulomb repulsion and phenomenological attraction onto flat bands. Exact solution at flat band limit and Quantum Mento Carlo (QMC) results for finite band width are shown. With the development of fermion sign bounds theory for QMC, we show the polynomial decay of sign problem in chiral flat band twisted bilayer graphene at integer fillings so that finite temperature characters are ready to study in this limit with affordable sign problem.
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Publication: 1. X Zhang, K Sun, H Li, G Pan, ZY Meng - arXiv preprint arXiv:2111.10018, 2021<br>2. X Zhang, G Pan, XY Xu, ZY Meng - Physical Review B, 2022<br>3. In preparation
Presenters
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Xu Zhang
The University of Hong Kong
Authors
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Xu Zhang
The University of Hong Kong
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Kai Sun
University of Michigan
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Zi Yang Meng
HKU, Department of Physics, Pokfulam Road, Hong Kong, The University of Hong Kong, Hong Kong University
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Gaopei Pan
Institute of Physics, Chinese Academy of Sciences
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Heqiu Li
University of Toronto
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Xiao Yan Xu
Shanghai Jiao Tong University
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Bin Bin Chen
The University of Hong Kong