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Phase coherence in the inelastic cotunneling regime.

Martin Sigrist1, Thomas Ihn, Klaus Ensslin

  • 1Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters
|February 21, 2006
PubMed
Summary

Coherent tunneling through quantum dots in an Aharonov-Bohm geometry was observed. High visibility indicates phase-coherent processes in elastic and inelastic cotunneling.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Quantum dots (QDs) are semiconductor nanocrystals with tunable electronic properties.
  • The Aharonov-Bohm (AB) effect describes the quantum mechanical phase shift of a charged particle's wavefunction due to a magnetic vector potential.
  • Cotunneling is an important quantum transport phenomenon in nanoscale devices, involving virtual intermediate states.

Purpose of the Study:

  • To investigate Aharonov-Bohm oscillations in a system of two coupled quantum dots.
  • To explore the role of phase-coherent processes in elastic and inelastic cotunneling.
  • To analyze the influence of bias voltage on oscillation phase in the inelastic cotunneling regime.

Main Methods:

  • Embedding two quantum dots with tunable mutual tunnel coupling into a two-terminal Aharonov-Bohm geometry.
  • Investigating Aharonov-Bohm oscillations in the cotunneling regime.
  • Measuring the visibility of oscillations as a function of experimental parameters.

Main Results:

  • Demonstration of coherent tunneling through nonresonant states in the cotunneling regime.
  • Measured oscillation visibilities exceeding 0.8, confirming the involvement of phase-coherent processes.
  • Detection of a pi oscillation-phase shift at the onset of inelastic cotunneling as a function of bias voltage.

Conclusions:

  • Phase-coherent transport is crucial for cotunneling phenomena in coupled quantum dot systems within an Aharonov-Bohm geometry.
  • The observed phenomena provide insights into quantum transport mechanisms at the nanoscale.
  • The study highlights the potential for controlling quantum phenomena through tunable coupling and external parameters.