Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, USA and Beijing Computational Science Research Center, Beijing 100084, China.
Physikalische Chemie, Technische Universität Dresden, D-01062 Dresden, Germany.
Phys Rev Lett. 2014 Mar 7;112(9):096805. doi: 10.1103/PhysRevLett.112.096805. Epub 2014 Mar 6.
We present, for the first time, an atomic-level and quantitative study of a strain-induced pseudomagnetic field in graphene nanoribbons with widths of hundreds of nanometers. We show that twisting strongly affects the band structures of graphene nanoribbons with arbitrary chirality and generates well-defined pseudo-Landau levels, which mimics the quantization of massive Dirac fermions in a magnetic field up to 160 T. Electrons are localized either at ribbon edges forming the edge current or at the ribbon center forming the snake orbit current, both being valley polarized. Our result paves the way for the design of new graphene-based nanoelectronics.
我们首次在原子尺度上对具有数百纳米宽度的石墨烯纳米带中的应变诱导赝磁场进行了定量研究。我们表明，扭曲强烈影响任意手性的石墨烯纳米带的能带结构，并产生明确定义的赝朗道能级，其模拟了在磁场中质量狄拉克费米子的量子化，最高可达 160T。电子要么定域在形成边缘电流的 ribbon 边缘，要么定域在形成蛇形轨道电流的 ribbon 中心，两者均具有谷极化。我们的结果为设计新型基于石墨烯的纳米电子学铺平了道路。
