论文标题
扭曲的三层石墨烯中的电带扁平，山谷通量和超导性
Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene
论文作者
论文摘要
扭曲的石墨烯多层已证明可以为工程师可控的电子状态产生多功能操场。在这里，通过将第一原理计算和低能模型相结合，我们证明了扭曲的石墨烯三层器提供了一个可调的系统，可以在其中电视控制范霍夫奇点。特别是，除了带扁平的散装谷电流外，还可以被局部化学掺杂剂淬灭。我们最终表明，在存在电子相互作用的情况下，出现了不均匀的超流体密度，其不均匀性会导致分散较高能带中的光谱特征。我们的结果提出了扭曲的三角形，作为可调范德华的异质结构，显示了可控制的扁平带和散装山谷电流。
Twisted graphene multilayers have demonstrated to yield a versatile playground to engineer controllable electronic states. Here, by combining first-principles calculations and low-energy models, we demonstrate that twisted graphene trilayers provide a tunable system where van Hove singularities can be controlled electrically. In particular, it is shown that besides the band flattening, bulk valley currents appear, which can be quenched by local chemical dopants. We finally show that in the presence of electronic interactions, a non-uniform superfluid density emerges, whose non-uniformity gives rise to spectroscopic signatures in dispersive higher energy bands. Our results put forward twisted trilayers as a tunable van der Waals heterostructure displaying electrically controllable flat bands and bulk valley currents.
