Design of electron wave filters in monolayer graphene with velocity modulations

作     者：孙立风 董利民 房超 

作者机构：Institute of Nuclear and New Energy Technology Tsinghua University Beijing Key Laboratory of Fine Ceramics Institute of Nuclear and New Energy Technology 

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 11104156) the Postdoctoral Science Foundation of China (CPSF) (Grant No. 2012M510405) the Independent Research and Development Fund of Tsinghua University (Grant No. 20121087948) Beijing Key Laboratory of Fine Ceramics Opening Fund (Grant No. 2012200110) 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第4期

页      码：410-414页

摘      要：We compare the transport properties of electrons in monolayer graphene by modulating the Fermi velocity inside the barrier. A critical transmission angle is found only when the Fermi velocity in the barriers is larger than the one outside the barriers. It is shown that the transmission exhibits periodicity with the incident angle below the critical transmission angle, and attenuates exponentially in the opposite situation. For both situations, peak splitting occurs in the transmission as the number of the velocity barriers increases, and the characteristics of the transmission suggest an interesting application of an excellent band-pass filter. The dependence of the conductance on the Fermi energy through an identical velocity- modulation structure differs wildly with different Fermi velocities of the barrier. The counterpart of the peak splitting is the sharp oscillations in the conductance profile. Furthermore, some oscillations for the multiple barriers are so sharp that the structure may be used as an excellent sensor.

主 题 词：velocity modulation periodicity peak splitting sharp oscillations 

学科分类：080902[080902] 0809[工学-计算机类] 08[工学] 0805[工学-能源动力学] 0704[理学-天文学类] 

核心收录：

D　O　I：10.1088/1674-1056/22/4/047203

馆 藏 号：203858081...