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arXiv 1602.02777cond-mat.mes-hall
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双层石墨烯中的Wigner晶相

Wigner crystal phases in bilayer graphene

P. G. Silvestrov, P. Recher

摘要:

一般认为,单层石墨烯中的维格纳晶体不能形成,因为库仑相互作用和动能的大小与电子密度的减小相似。然而,这种缩放的论点并不适用于双层石墨烯中的低能态。我们考虑在弱掺杂的双层石墨烯中形成维格纳晶体,其能隙由垂直电场打开。我们认为,在这个系统中的维格纳晶体的形成不仅是可能的,但不同的相位的晶体具有非常奇特的属性可能存在于这里取决于系统参数。

英文摘要:

It is generally believed that a Wigner Crystal in single layer graphene can not form because the magnitudes of the Coulomb interaction and the kinetic energy scale similarly with decreasing electron density. However, this scaling argument does not hold for the low energy states in bilayer graphene. We consider the formation of a Wigner Crystal in weakly doped bilayer graphene with an energy gap opened by a perpendicular electric field. We argue that in this system the formation of the Wigner Crystal is not only possible, but different phases of the crystal with very peculiar properties may exist here depending on the system parameters.

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