Single-Parameter Quantum Pumping in Graphene Nanoribbons with Staggered Sublattice Potential  

作　　者：李艳华 熊永建 

机构地区：[1]Department of Physics, Ningbo University, Ningbo 315211

出　　处：《Chinese Physics Letters》2017年第5期96-100,共5页中国物理快报（英文版）

基　　金：Supported by the K.C.Wong Magna Fund in Ningbo University;the National Natural Science Foundation of China under Grant No 11474174

摘　　要：We present a theoretical study of quantum charge pumping in metallic armchair graphene nanoribbons using the Floquet Green function method. A central part of the ribbon acting as the scattering region is supposed to have staggered sublattiee potential to open a finite band gap. A single ae gate is asymmetrically applied to a part of the scattering region to drive the pumping. Corresponding to the gap edges, there are two pumped current peaks with opposite current directions, which can be reversed by changing the position of the ac gate relative to the scattering region. The effects of the parameters, such as the staggered sublattice potential, the driving frequency and the geometric parameters of the structure, on the pumping are discussed.We present a theoretical study of quantum charge pumping in metallic armchair graphene nanoribbons using the Floquet Green function method. A central part of the ribbon acting as the scattering region is supposed to have staggered sublattiee potential to open a finite band gap. A single ae gate is asymmetrically applied to a part of the scattering region to drive the pumping. Corresponding to the gap edges, there are two pumped current peaks with opposite current directions, which can be reversed by changing the position of the ac gate relative to the scattering region. The effects of the parameters, such as the staggered sublattice potential, the driving frequency and the geometric parameters of the structure, on the pumping are discussed.

关 键 词：Single-Parameter Quantum Pumping in Graphene Nanoribbons with Staggered Sublattice Potential 

分 类 号：O613.71[理学—无机化学] TB383.1[理学—化学]