论文标题
石墨烯系统中的全电山谷过滤（i）：集成电valleytronics的途径
All-electrical valley filtering in graphene systems (I): A path to integrated electro-valleytronics
论文作者
论文摘要
通过运输测量来探测和控制石墨烯系统中的自由度，这是充分利用这种二维材料独特特性的主要挑战。在这项理论工作中，我们表明可以通过由间隙石墨烯制成的量子线几何形状来实现该目标，该量子是具有以下有利特征的山谷过滤器：i）所有电气门控制，ii）ii）可转换谷地极性，iii）稳健性，可抗构型波动，iv）iv）iv）iv）iv）iv）室温运行的潜力。该山谷过滤是通过将双层石墨烯与垂直电场或H-BN上的单层石墨烯与垂直电场或单层石墨烯的组合结合在一起，通过水平电场分裂的，以及通过缺陷散射混合的。除了充当valleytronics的构件外，提出的配置还可以在电气和谷化形式之间转换信号，从而可以整合电子和谷化组件，以实现电valleytronics。
Probing and controlling the valley degree of freedom in graphene systems by transport measurements has been a major challenge to fully exploit the unique properties of this two-dimensional material. In this theoretical work, we show that this goal can be achieved by a quantum-wire geometry made of gapped graphene that acts as a valley filter with the following favorable features: i) all electrical gate control, ii) electrically switchable valley polarity, iii) robustness against configuration fluctuation, and iv) potential for room temperature operation. This valley filtering is accomplished by a combination of gap opening in either bilayer graphene with a vertical electrical field or single layer graphene on h-BN, valley splitting with a horizontal electric field, and intervalley mixing by defect scattering. In addition to functioning as a building block for valleytronics, the proposed configuration makes it possible to convert signals between electrical and valleytronic forms, thus allowing for the integration of electronic and valleytronic components for the realization of electro-valleytronics.
