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Coherence and partial coherence in interacting electron systems.

J König1, Y Gefen

  • 1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters
|May 1, 2001
PubMed
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Electron transport coherence in quantum dots is studied. First-order contributions to transport can be coherent, challenging the sequential-tunneling model.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic physics

Background:

  • Electron transport through quantum dots is crucial for quantum computing.
  • Understanding coherence is key to controlling quantum phenomena.

Purpose of the Study:

  • To investigate the coherence of electron transport in interacting quantum dots.
  • To analyze the relationship between coherent transport and flux-sensitive conductance in Aharonov-Bohm interferometers.

Main Methods:

  • Theoretical analysis of electron transport in three types of Aharonov-Bohm interferometers.
  • Detailed examination of transport contributions up to second order in dot level linewidth.
  • Calculation of interference signal asymmetry due to spin-flip induced incoherence.

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Main Results:

  • Predicted asymmetry in interference signals around resonance peaks due to spin-flip processes.
  • Demonstrated that first-order transport contributions can be partially or fully coherent.
  • Contrasted findings with the sequential-tunneling model, which assumes incoherent first-order processes.

Conclusions:

  • First-order electron transport through quantum dots can exhibit coherence.
  • This coherence challenges traditional models and has implications for quantum device design.
  • Spin-flip processes introduce asymmetry in interference signals, highlighting the role of decoherence.