Antiferromagnetically ordered Mott insulator and d plus id superconductivity in twisted bilayer graphene: a quantum Monte Carlo study

被引：123

作者：

Huang, Tongyun ^{[1
]}

Zhang, Lufeng ^{[1
]}

Ma, Tianxing ^{[1
]}

机构：

[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

来源：

SCIENCE BULLETIN | 2019年 / 64卷 / 05期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Twisted bilayer graphene; Mott insulator; Superconductivity; Quantum Monte Carlo; COLLOQUIUM; TRANSPORT;

D O I：

10.1016/j.scib.2019.01.026

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Using exact quantum Monte Carlo method, we examine the recent novel electronic states seen in magic-angle graphene superlattices. From the Hubbard model on a double-layer honeycomb lattice with a rotation angle theta = 1.08 degrees, we reveal that an antiferromagnetically ordered Mott insulator emerges beyond a critical U-c at half filling, and with a small doping, the pairing with d + id symmetry dominates over other pairings at low temperature. The effective d + id pairing interaction strongly increases as the on-site Coulomb interaction increases, indicating that the superconductivity is driven by electron-electron correlation. Our non-biased numerical results demonstrate that the twisted bilayer graphene shares the similar superconducting mechanism of high temperature superconductors, which is a new and ideal platform for further investigating the strongly correlated phenomena. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

引用

页码：310 / 314

页数：5

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