Valley-dependent transport in a mescoscopic twisted bilayer graphene device  

作　　者：史文萱 刘翰林 汪军 Wen-Xuan Shi;Han-Lin Liu;Jun Wang(School of Physics,Southeast University,Nanjing 210096,China)

机构地区：[1]School of Physics,Southeast University,Nanjing 210096,China

出　　处：《Chinese Physics B》2024年第1期61-65,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.12174051 and 11874221)。

摘　　要：We study the valley-dependent electron transport in a four-terminal mesoscopic device of the two monolayer graphene nanoribbons vertically stacked together, where the intersection forms a bilayer graphene lattice with a controllable twist angle. Using a tight-binding lattice model, we show that the longitudinal and transverse conductances exhibit significant valley polarization in the low energy regime for small twist angles. As the twist angle increases, the valley polarization shifts to the high energy regime. This arises from the regrouping effect of the electron band in the twisted bilayer graphene region. But for relatively large twist angles, no significant valley polarization is observed. These results are consistent with the spectral densities of the twisted bilayer graphene.

关 键 词：twisted bilayer graphene valley-dependent transport graphene nanoribbon CONDUCTANCE 

分 类 号：TQ127.11[化学工程—无机化工] O469[理学—凝聚态物理]