Dynamic conductance in L-shaped graphene nanosystems

被引：7
|
作者：
Ye, En-Jia [1 ]
Nie, Yanguang [1 ]
Shi, Haifeng [1 ]
Zhang, Chengliang [1 ]
Zhao, Xuean [2 ]
机构：
[1] Jiangnan Univ, Sch Sci, Wuxi 214122, Peoples R China
[2] Zhejiang Univ, Zhejiang Inst Modern Phys, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China
来源：
JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 01期
基金：
中国国家自然科学基金;
关键词：
QUANTUM; ADMITTANCE; DENSITIES; TRANSPORT; STATES;
D O I：
10.1063/1.4905225
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Dynamic conductance of nanocircuit, which demonstrates dc and ac transport properties, is regarded as vital indicator for device feature. With the help of nonequilibrium Green's function technology and Buttiker's ac transport theory, we present dynamic conductance in L-shaped graphene nanosystems (LGNSs). It is found that electronic transport is highly sensitive to the geometric feature as well as the size of LGNSs. The armchair edge lead determines whether LGNS shows ac response or not around Dirac point. The increase of width of zigzag edge lead suppresses dc conductance and induces capacitive responses at the anti-resonance states. This is due to large dwell time originated from edge state in zigzag edge lead. In the energy region far away from Dirac point, LGNS responds inductively with the transportation channel opens. Behaviors of dynamic conductance at Dirac point and anti-resonance states are discussed by interesting spacial-resolved local density of states. (C) 2015 AIP Publishing
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页数：6
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