Transport through T-shaped quantum wires under potential modulation: Lattice Green’s function approach

Yuan Ping Chen, Xiao Hong Yan, and Yue E. Xie
Phys. Rev. B 71, 245335 – Published 30 June 2005

Abstract

By developing the lattice Green’s function approach, we study transport properties of T-shaped quantum wires (TQWR) under potential modulation. It is found that the potential barrier in the vertical arm induces a dip-peak structure in conductance straight through and around the bend. The increase of potential thickness results in the dip-peak couples being more pronounced, while the number of dip-peak couple also increases with the thickness. The dip-peak structures are related to the quasibound states localized at the junction of the TQWR. We numerically analyze the dependence of the quasi-bound state energy on the potential height and width. Different conductance profiles can be selected by the potential modulation on coupled TQWR.

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  • Received 25 May 2004

DOI:https://doi.org/10.1103/PhysRevB.71.245335

©2005 American Physical Society

Authors & Affiliations

Yuan Ping Chen, Xiao Hong Yan*, and Yue E. Xie

  • Institute of Modern Physics and Department of Physics, Xiangtan University, Xiangtan 411105, China

  • *Corresponding author; email address: xhyan@xtu.edu.cn

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Issue

Vol. 71, Iss. 24 — 15 June 2005

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