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Related Experiment Videos

Dwell-time-limited coherence in open quantum dots.

B Hackens1, S Faniel, C Gustin

  • 1CERMIN, PCPM and DICE Labs, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.

Physical Review Letters
|May 21, 2005
PubMed
Summary

Electron phase coherence time saturates in quantum dots (QDs) due to dwell time limitations at low temperatures. This finding offers new insights into electron interference effects in these mesoscopic systems.

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Area of Science:

  • Condensed matter physics
  • Mesoscopic physics
  • Quantum electronics

Background:

  • Electron phase coherence time (τ(φ)) is crucial for quantum interference effects.
  • Saturation of τ(φ) in quantum dots (QDs) at low temperatures is a long-standing problem.
  • Understanding this saturation is key to advancing quantum devices.

Purpose of the Study:

  • To measure electron phase coherence time (τ(φ)) in open ballistic quantum dots (QDs).
  • To investigate the factors causing the saturation of τ(φ) at low temperatures.
  • To provide new insights into electron interference in QDs.

Main Methods:

  • Measurements of electron phase coherence time (τ(φ)) were performed.
  • Experiments utilized open ballistic quantum dots (QDs) fabricated from InGaAs heterostructures.

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  • Data was analyzed in conjunction with previous studies on GaAs QDs.

    • Main Results:

    • Observed saturation of τ(φ) below 0.5 K < T(onset) < 5 K.
    • Saturation was found to be intrinsic and dependent on QD size and openings.
    • Dwell time was identified as the limiting factor for electron interference at low temperatures.

    Conclusions:

    • The dwell time is the limiting factor for electron interference effects in QDs at low temperatures.
    • QD size and openings significantly influence the saturation of τ(φ).
    • This study provides a comprehensive understanding of τ(φ) saturation in mesoscopic systems.