Department of Physics, Lancaster University, LA1 4YB Lancaster, United Kingdom.
Phys Rev Lett. 2013 Jun 28;110(26):266801. doi: 10.1103/PhysRevLett.110.266801. Epub 2013 Jun 24.
In inhomogeneously strained graphene, low-energy electrons experience a valley-antisymmetric pseudomagnetic field which leads to the formation of localized states at the edge between the valence and conduction bands, understood in terms of peculiar n=0 pseudomagnetic Landau levels. Here we show that such states can manifest themselves as an isolated quadruplet of low-energy conductance resonances in a suspended stretched graphene ribbon, where clamping by the metallic contacts results in a strong inhomogeneity of strain near the ribbon ends.
在非均匀应变的石墨烯中，低能电子会经历一个谷-反称赝磁场，这导致在价带和导带之间的边缘处形成局域态，可以用特殊的 n=0 赝磁朗道能级来理解。在这里，我们表明，在一个悬浮拉伸的石墨烯带中，这种状态可以表现为一个孤立的低能电导共振四重峰，其中金属接触的夹持导致在带的末端附近产生强烈的应变不均匀性。
