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Metal-insulator transition and dominant d + id pairing symmetry in twisted bilayer graphene

机译：金属绝缘体过渡和扭曲双层石墨烯中的占据D + ID配对对称性

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摘要

Motivated by recent experimental studies that have found signatures of a correlated insulator phase and tuning superconductivity in twisted bilayer graphene, we study the temperature-dependent conductivity, the spin correlation, and the superconducting pairing correlation within a two-orbital Hubbard model on an emergent honeycomb lattice. The evaluation of the temperature dependence of the conductivity demonstrates that there is a metal-insulator transition and the Mott phase at strong coupling is accompanied by antiferromagnetic order. The electronic correlation drives ad + id superconducting pairing to be dominant over a wide filling region. All of the dc conductivity, the spin correlation, and the superconductivity are suppressed as the interlayer coupling strength increases, and the critical U_c for the metal-insulator transition is also reduced. Our intensive numerical results reveal that twisted bilayer graphene should be a uniquely tunable platform for exploring strongly correlated phenomena.
机译：通过最近的实验研究，在扭曲的双层石墨烯中发现相关绝缘体相和调节超导性的签名，我们研究了一种在出苗蜂窝上的两个轨道喧哗模型中的温度依赖性导电性，旋转相关性和超导配对相关性格子。对电导率的温度依赖性的评价表明存在金属绝缘体转变，并且在强耦合下的Mott相由反铁磁序列伴随。电子相关驱动AD + ID超导配对在宽填充区域上占主导地位。所有DC电导率，旋转相关性和超导性被抑制为层间耦合强度的增加，并且还减少了金属绝缘体转变的临界U_C。我们的密集数值结果表明，扭曲的双层石墨烯应该是一个独特的可调平台，用于探索强烈相关的现象。

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  • 来源
    《Physical review》 |2020年第15期|155413.1-155413.6|共6页
  • 作者

    Wanying Chen; Yonghuan Chu; Tongyun Huang; Tianxing Ma;

  • 作者单位

    Department of Physics Beijing Normal University Beijing 100875 China;

    Department of Physics Beijing Normal University Beijing 100875 China;

    Department of Physics Beijing Normal University Beijing 100875 China;

    Department of Physics Beijing Normal University Beijing 100875 China;

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