Confined State and Electronic Transport in an Artificial Graphene-Based Tunnel Junction

Artificial graphene structures embedded in semiconductors could open novel routes for studies of electron interactions in 1ow-dimensional systems. We propose a way to manipulate the transport properties of massless Dirac fermions in an artificial graphene-based tunnel junction. Velocity-modulation c...

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Published inCommunications in theoretical physics Vol. 56; no. 12; pp. 1135 - 1139
Main Author 袁建辉 张建军 曾奇军 张俊佩 成泽
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.12.2011
Subjects
Barriers
Confinement
Electronics
Fermions
Graphene
Semiconductors
Tunnel junctions
Wave propagation
人造石墨
国家元首
基础
密闭
电子相互作用
运输
速度调制
隧道结
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Summary:Artificial graphene structures embedded in semiconductors could open novel routes for studies of electron interactions in 1ow-dimensional systems. We propose a way to manipulate the transport properties of massless Dirac fermions in an artificial graphene-based tunnel junction. Velocity-modulation control of electron wave propagation in the different regions can be regarded as velocity barriers. Transmission probability of electron is affected profoundly by this velocity barrier. We find that there is no confinement for Dirac electron as the velocity ratio ζ is less than 1, but when the velocity ratio is larger than 1 the confined state appears in the continuum band. These localized Dirac electrons may lead to the decreasing of transmission probability.
Bibliography:Artificial graphene structures embedded in semiconductors could open novel routes for studies of electron interactions in 1ow-dimensional systems. We propose a way to manipulate the transport properties of massless Dirac fermions in an artificial graphene-based tunnel junction. Velocity-modulation control of electron wave propagation in the different regions can be regarded as velocity barriers. Transmission probability of electron is affected profoundly by this velocity barrier. We find that there is no confinement for Dirac electron as the velocity ratio ζ is less than 1, but when the velocity ratio is larger than 1 the confined state appears in the continuum band. These localized Dirac electrons may lead to the decreasing of transmission probability.
ballistic transport, relativistic wave equations, Carbon diamond graphite
11-2592/O3
YUAN Jian-Hui, ZHANG Jian-Jun, ZENG Qi-Jun, ZHANG Jun-Pei, CHENG Ze （School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China）
ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0253-6102
DOI:10.1088/0253-6102/56/6/28