在線閱讀 --自然科學版 2021年3期《邊緣勢效應對電子輸運性質的影響》
邊緣勢效應對電子輸運性質的影響--[在線閱讀]
歐培航1, 劉龍2, 白志明1
1. 河北科技大學 理學院, 河北 石家莊 050018;
2. 河北工業職業技術學院 智能制造系, 河北 石家莊 050091
起止頁碼: 251--259頁
DOI: 10.13763/j.cnki.jhebnu.nse.202102009
摘要
研究了磁場及無序雜質存在條件下,邊緣勢效應對磁場下二維無序雜質系統中的電子輸運性質的影響.邊緣勢越小,電子輸運通道越容易打開,電導"臺階"越易向能量小的區域平移;邊緣勢較大,電子需要較大的費米能才能打開一個量子通道,電導"臺階"越向右平移;邊緣勢一大一小時,"臺階"有先左后右的平移趨勢.系統電導隨著磁場的變化表現出周期性振蕩行為,系統電導的極值也隨邊緣勢的變大而減小.受雜質散射的影響,系統電導隨無序雜質質量百分數的增大而減小.

Influence of Edge Potential Effect on the Transport Properties of Electrons
OU Peihang1, LIU Long2, BAI Zhiming1
1. School of Sciences, Hebei University of Science and Technology, Hebei Shijiazhuang 050018, China;
2. Intelligent Manufacturing Institute, Hebei College of Industry and Technology, Hebei Shijiazhuang 050091, China
Abstract:
In the 2D impurity system,we study the effect of edge potential influence on the conductance with the existence of magnetic field and impurity.The smaller the edge potential is,the easier the electron transport channel is opened,and the conductance "step" moves to the smaller energy region;when the edge potential is large,the electrons need more Fermi energy to open a quantum channel,and the conductance "step" shifts to the right;when there are two edge potentials,a large one and a smaller one,and the "step" moves to the left first,and then to the right.The conductance exhibits periodic oscillation with the external magnetic field,the extremum of the conductance decreases with the increase of the edge potential.With the increase of the impurity concentration,the conductance decreases.

收稿日期: 2020-10-08
基金項目: 河北工業職業技術學院博士基金(zk202104)

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