Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction  

作　　者：张林 汪军 

机构地区：[1]Department of Applied Physics, College of Science, Nanjing Forestry University [2]Department of Physics, Southeast University

出　　处：《Chinese Physics B》2014年第8期457-462,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.110704033);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK2010416);the Natural Science Foundation for Colleges and Universities in Jiangsu Province,China(Grant No.13KJB140005)

摘　　要：The valley valve effect was predicted in a straight zigzag graphene nanoribbon （ZGR） p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect could be preserved in the system and the Y-shaped connection does not mix the valley index or the pseudoparities of quasiparticles. It is also shown that the Y-shaped ZGR device can be used to separate spins in real space according to the unchanged valley valve effect. Our finding might pave a way to manipulate and detect spins in a multi-terminal graphene-based spin device.The valley valve effect was predicted in a straight zigzag graphene nanoribbon （ZGR） p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect could be preserved in the system and the Y-shaped connection does not mix the valley index or the pseudoparities of quasiparticles. It is also shown that the Y-shaped ZGR device can be used to separate spins in real space according to the unchanged valley valve effect. Our finding might pave a way to manipulate and detect spins in a multi-terminal graphene-based spin device.

关 键 词：valley selection rule zigzag graphene nanoribbon pseudoparity CONDUCTANCE 

分 类 号：O469[理学—凝聚态物理]