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Persistent current states in bilayer graphene

机译:双层石墨烯中的持久电流状态

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摘要

We argue that at finite carrier density and large displacement fields, bilayer graphene is prone to ℓ = 0 and ℓ = 1 Pomeranchuk Fermi-surface instabilities. The broken symmetries are driven by nonlocal exchange interactions which favor momentum-space condensation. We find that electron-electron interactions lead first to spontaneous valley polarization, which breaks time-reversal invariance and is associated with spontaneous orbital magnetism, and then under some circumstances to a nematic phase with reduced rotational symmetry. When present, nematic order is signaled by reduced symmetry in the dependence of optical absorption on light polarization.
机译:我们认为,在有限的载流子密度和大位移场下,双层石墨烯倾向于ℓ= 0和ℓ= 1 Pomeranchuk Fermi表面不稳定性。破碎的对称性是由非局部交换相互作用驱动的,这种相互作用有利于动量空间凝聚。我们发现电子-电子相互作用首先导致自发的谷极化,这打破了时间反转不变性,并与自发的轨道磁性有关,然后在某些情况下形成了具有降低的旋转对称性的向列相。当存在时,向列顺序通过光吸收对光偏振的依赖性降低的对称性来发出信号。

著录项

  • 来源
    《Physical review》 |2015年第15期|155423.1-155423.6|共6页
  • 作者单位

    Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA,Department of Physics, University of Seoul, Seoul, 130-743, Korea;

    NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy;

    Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    broken symmetry phases; persistent currents;

    机译:对称阶段破裂;持续的电流;

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