Transient quantum transport in double-dot Aharonov-Bohm interferometers

Matisse Wei-Yuan Tu, Wei-Min Zhang, Jinshuang Jin, O. Entin-Wohlman, and A. Aharony
Phys. Rev. B 86, 115453 – Published 28 September 2012

Abstract

Real-time nonequilibrium quantum dynamics of electrons in double-dot Aharonov-Bohm (AB) interferometers is studied using an exact solution of the master equation. The building of the coherence between the two electronic paths shows up via the time-dependent amplitude of the AB oscillations in the transient transport current and can be enhanced by varying the applied bias on the leads, the on-site energy difference between the dots and the asymmetry of the coupling of the dots to the leads. The transient oscillations of the transport current do not obey phase rigidity. The circulating current has an antisymmetric AB oscillation in the flux. The nondegeneracy of the on-site energies and the finite bias cause the occupation in each dot to have an arbitrary flux dependence as the coupling asymmetry is varied.

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  • Received 3 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.115453

©2012 American Physical Society

Authors & Affiliations

Matisse Wei-Yuan Tu and Wei-Min Zhang*

  • Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan

Jinshuang Jin

  • Department of Physics, Hangzhou Normal University, Hangzhou 310036, China

O. Entin-Wohlman and A. Aharony

  • Physics Department, Ben Gurion University, Beer Sheva 84105, Israel

  • *wzhang@mail.ncku.edu.tw
  • orawohlman@bgu.ac.il; also at Tel Aviv University, Tel Aviv 69978, Israel.
  • aaharonyaa@bgu.ac.il; also at Tel Aviv University, Tel Aviv 69978, Israel.

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Issue

Vol. 86, Iss. 11 — 15 September 2012

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