Transport through a quantum ring, dot, and barrier embedded in a nanowire in magnetic field

Vidar Gudmundsson, Yu-Yu Lin, Chi-Shung Tang, Valeriu Moldoveanu, Jens Hjorleifur Bardarson, and Andrei Manolescu
Phys. Rev. B 71, 235302 – Published 2 June 2005

Abstract

We investigate the transport through a quantum ring, a dot, and a barrier embedded in a nanowire in a homogeneous perpendicular magnetic field. To be able to treat scattering potentials of finite extent in a magnetic field we use a mixed momentum-coordinate representation to obtain an integral equation for the multiband scattering matrix. For a large embedded quantum ring we are able to obtain Aharonov-Bohm type of oscillations with superimposed narrow resonances caused by interaction with quasibound states in the ring. We also employ the scattering matrix approach to calculate the conductance through a semiextended barrier or well in the wire. The numerical implementations we resort to in order to describe the cases of weak and intermediate magnetic field allow us to produce high resolution maps of the “near field” scattering wave functions, which are used to shed light on the underlying scattering processes.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
10 More
  • Received 15 December 2004

DOI:https://doi.org/10.1103/PhysRevB.71.235302

©2005 American Physical Society

Authors & Affiliations

Vidar Gudmundsson1, Yu-Yu Lin2, Chi-Shung Tang3, Valeriu Moldoveanu4, Jens Hjorleifur Bardarson1, and Andrei Manolescu1,4

  • 1Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland
  • 2Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
  • 3Physics Division, National Center for Theoretical Sciences, P. O. Box 2-131, Hsinchu 30013, Taiwan
  • 4Institute of Physics and Technology of Materials, P. O. Box MG7, Bucharest-Magurele, Romania

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 71, Iss. 23 — 15 June 2005

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×