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arXiv · 1201.2876

Dynamics of coherences in the interacting double-dot Aharonov-Bohm interferometer: Exact numerical simulations

Salil Bedkihal·Dvira Segal
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Abstract

We study the real time dynamics of electron coherence in a double quantum dot two-terminal Aharonov-Bohm geometry, taking into account repulsion effects between the dots' electrons. The system is simulated by extending a numerically exact path integral method, suitable for treating transport and dissipation in biased impurity models [Phys. Rev. B 82, 205323 (2010)]. Numerical simulations at finite interaction strength are supported by master equation calculations in two other limits: assuming non-interacting electrons, and working in the Coulomb blockade regime. Focusing on the intrinsic coherence dynamics between the double-dot states, we find that its temporal characteristics are preserved under weak-to-intermediate inter-dot Coulomb interaction. In contrast, in the Coulomb blockade limit, a master equation calculation predicts coherence dynamics and a steady-state value which notably deviate from the finite interaction case.

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Salil Bedkihal, Dvira Segal. 2012-01-13. Dynamics of coherences in the interacting double-dot Aharonov-Bohm interferometer: Exact numerical simulations. https://doi.org/10.1103/physrevb.85.155324

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