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Spontaneous chiral symmetry breaking in bilayer graphene

机译：双层石墨烯的自发手性对称性破坏

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摘要

Bilayer graphene and its thicker cousins with Rhombohedral stacking have attracted considerable attention because of their susceptibility to a variety of broken chiral symmetry states. Due to large density-of-states and quantized Berry phases near their gapless band touching points, each spin-valley flavor spontaneously transfers charge between layers to yield opening of energy gaps in quasiparticle spectra and spreading of momentum-space Berry curvatures. In this article we review the development of theories that predicted such chiral symmetry breaking and classified the possible topological many-body ground states, and the observations in recent experiments that are in reasonable agreement with these theories. (C) 2015 Elsevier B.V. All rights reserved.
机译：双层石墨烯及其较厚的表亲与菱面体堆叠，由于其对各种破坏的手性对称状态的敏感性而引起了广泛的关注。由于大的状态密度和接近其无间隙带接触点的量化Berry相，每种自旋谷型香精自发地在层之间转移电荷，从而在准粒子光谱中产生能隙的打开和动量空间Berry曲率的扩散。在本文中，我们回顾了预测这种手性对称性破裂并对可能的拓扑多体基态进行分类的理论的发展，以及最近与这些理论合理吻合的实验中的观察结果。 （C）2015 Elsevier B.V.保留所有权利。

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