论文标题
扭曲的双层石墨烯中的时间逆向对称性对称性对称分解四倍体凝结物
Prediction of time-reversal-symmetry breaking fermionic quadrupling condensate in twisted bilayer graphene
论文作者
论文摘要
最近的平均场计算表明，扭曲的双层石墨烯的超导状态表现出列表的列表或时间反转对称性的自发分解。相对于费米能量的材料的二维特征和较大的临界温度表明，材料应具有明显的波动。我们使用蒙特卡洛模拟研究了这些波动的影响。我们表明，在早先针对扭曲的双层石墨烯的模型中，对于所有考虑的参数，有一个波动引起的相位，具有四倍的费米子阶。这种四电子冷凝物，而不是超导性，表现出时间交流对称性的自发断裂。我们的结果表明，扭曲的双层石墨烯是一个特别有希望的平台，用于研究不同类型的冷凝物，除了配对符号范式之外。
Recent mean-field calculations suggest that the superconducting state of twisted bilayer graphene exhibits either a nematic order or a spontaneous breakdown of the time-reversal symmetry. The two-dimensional character of the material and the large critical temperature relative to the Fermi energy dictate that the material should have significant fluctuations. We study the effects of these fluctuations using Monte Carlo simulations. We show that in a model proposed earlier for twisted bilayer graphene there is a fluctuation-induced phase with quadrupling fermionic order for all considered parameters. This four-electron condensate, instead of superconductivity, shows a spontaneous breaking of time-reversal symmetry. Our results suggest that twisted bilayer graphene is an especially promising platform to study different types of condensates, beyond the pair-condensate paradigm.
