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Conductance fluctuations and weak localization in chaotic quantum dots.

E R P Alves1, C H Lewenkopf

  • 1Instituto de Física, Universidade do Estado do Rio de Janeiro, R. São Francisco Xavier, 524, 20559-900 Rio de Janeiro, Brazil.

Physical Review Letters
|July 5, 2002
PubMed
Summary

We investigated temperature effects on electron conductance in quantum dots. Our findings reveal overlooked energy correlations and an underestimation of dephasing times, impacting conductance fluctuation analysis.

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Area of Science:

  • Condensed Matter Physics
  • Mesoscopic Physics
  • Quantum Transport

Background:

  • Ballistic electrons in chaotic quantum dots exhibit universal conductance fluctuations.
  • Temperature, dephasing, and thermal smearing influence these fluctuations.

Purpose of the Study:

  • To analyze temperature's effect on conductance fluctuations.
  • To investigate the role of dephasing and thermal smearing.
  • To identify key factors influencing conductance statistics.

Main Methods:

  • Studying statistical features of electron conductance.
  • Analyzing temperature's influence on universal conductance fluctuations.
  • Incorporating dephasing and thermal smearing effects.

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Main Results:

  • Identified the importance of energy correlations in transmission for conductance moments.
  • Revealed an ambiguity in determining dephasing rates from weak localization.
  • Found that dephasing times at low temperatures are underestimated.

Conclusions:

  • Energy correlations are crucial for accurate conductance variance and moment calculations.
  • Current methods for dephasing rate determination are ambiguous.
  • Low-temperature dephasing times in quantum dots are systematically underestimated.