Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots

Gunnar Thorgilsson, Chi-Shung Tang, and Vidar Gudmundsson
Phys. Rev. B 76, 195314 – Published 15 November 2007

Abstract

We consider wave packet propagation in a quantum wire with either an embedded antidot or an embedded parallel double open quantum dot under the influence of a uniform magnetic field. The magnetoconductance and the time evolution of an electron wave packet are calculated based on the Lippmann-Schwinger formalism. This approach allows us to look at arbitrary embedded potential profiles and illustrate the results by performing computational simulations for the conductance and the time evolution of the electron wave packet through the quantum wire. In the double-dot system, we observe a long-lived resonance state that enhances the spatial spreading of the wave packet, and quantum skippinglike trajectories are induced when the envelop function of the wave packet covers several subbands in appropriate magnetic fields.

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  • Received 1 August 2007

DOI:https://doi.org/10.1103/PhysRevB.76.195314

©2007 American Physical Society

Authors & Affiliations

Gunnar Thorgilsson1, Chi-Shung Tang2,3,*, and Vidar Gudmundsson1,†

  • 1Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland
  • 2Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
  • 3Department of Mechanical Engineering, National United University, Miaoli 36003, Taiwan

  • *cstang@nuu.edu.tw
  • vidar@raunvis.hi.is

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Issue

Vol. 76, Iss. 19 — 15 November 2007

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