Lima Leandro R F, Hernández Alexis R, Pinheiro Felipe A, Lewenkopf Caio
Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil.
J Phys Condens Matter. 2016 Dec 21;28(50):505303. doi: 10.1088/0953-8984/28/50/505303. Epub 2016 Oct 21.
Based on the investigation of the multi-terminal conductance of a system composed of two graphene nanoribbons, in which one is on top of the other and rotated by [Formula: see text], we propose a setup for a 50/50 electronic beam splitter that neither requires large magnetic fields nor ultra low temperatures. Our findings are based on an atomistic tight-binding description of the system and on the Green function method to compute the Landauer conductance. We demonstrate that this system acts as a perfect 50/50 electronic beam splitter, in which its operation can be switched on and off by varying the doping (Fermi energy). We show that this device is robust against thermal fluctuations and long range disorder, as zigzag valley chiral states of the nanoribbons are protected against backscattering. We suggest that the proposed device can be applied as the fundamental element of the Hong-Ou-Mandel interferometer, as well as a building block of many devices in electron optics.
基于对由两个石墨烯纳米带组成的系统的多端电导的研究，其中一个位于另一个之上并旋转了[公式：见文本]，我们提出了一种用于50/50电子束分束器的设置，该设置既不需要强磁场也不需要超低温。我们的研究结果基于该系统的原子级紧束缚描述以及用于计算朗道尔电导的格林函数方法。我们证明该系统可作为完美的50/50电子束分束器，其操作可通过改变掺杂（费米能量）来开启和关闭。我们表明该器件对热涨落和长程无序具有鲁棒性，因为纳米带的锯齿形谷手性态受到保护而不会发生背散射。我们建议所提出的器件可作为洪-欧-曼德尔干涉仪的基本元件，以及电子光学中许多器件的构建模块。
