Space dependent Fermi velocity in strained graphene.
Space dependent Fermi velocity in strained graphene.
复制标题
应变石墨烯中空间依赖的费米速度。
DOI：
10.1103/physrevlett.108.227205
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
M. Vozmediano
中科院分区：
文献类型：
--
作者：
Fernando de Juan;M. Sturla;M. Vozmediano
我们研究了两种不同的弯曲石墨烯模型之间的一些明显的差异：紧束缚和弹性理论的基础上，在弯曲空间的量子场论的基础上的协变方法。我们证明，应变或波纹样品将有一个空间依赖性的费米速度在任何一种方法，可以影响当地的探测实验在石墨烯的解释。我们还推广了紧束缚的方法一般的非均匀应变，并找到一个规范场的应变张量的导数成正比，具有相同的形式作为一个在协变方法。
We investigate some apparent discrepancies between two different models for curved graphene: the one based on tight-binding and elasticity theory, and the covariant approach based on quantum field theory in curved space. We demonstrate that strained or corrugated samples will have a space-dependent Fermi velocity in either approach that can affect the interpretation of local probe experiments in graphene. We also generalize the tight-binding approach to general inhomogeneous strain and find a gauge field proportional to the derivative of the strain tensor that has the same form as the one obtained in the covariant approach.