论文标题
双层石墨烯可以成为分数金属吗？
Can bilayer graphene become a fractional metal?
论文作者
论文摘要
众所周知，电子相互作用会导致金属的费米表面的完美自旋极化。在这种情况下，只有一半的非相互作用的费米表面可用，因此该阶段通常称为“半金属”。在这里，我们认为，在具有嵌套的多波段电子系统中，可能会进一步的费米表面“分数化”。以AA双层石墨烯为方便的测试用例，我们证明，在对电子相互作用的适当条件下，掺杂的AA BiLayer石墨烯可以容纳“四分之一级”状态。在这样的状态下，只有四分之一的非相互作用的费米表面（费米轮廓）达到费米能。在较高的掺杂水平上，其他“分数”金属可能会出现。我们简要分析了这些提出阶段的运输特性。
It is known that electron interactions can cause a perfect spin polarization of the Fermi surface of a metal. In such a situation only half of the non-interacting Fermi surface is available, and thus this phase is commonly referred to as a 'half-metal'. Here we argue that, in multi-band electronic systems with nesting, further 'fractionalization' of the Fermi surface is possible. Taking the AA bilayer graphene as a convenient test case, we demonstrate that, under suitable conditions imposed on the electron interactions, doped AA bilayer graphene can host a 'quarter-metal' state. In such a state, only one quarter of the non-interacting Fermi surface (Fermi contour) reaches the Fermi energy. At higher doping level, other 'fractional' metals can emerge. We briefly analyze the transport properties of these proposed phases.
