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Related Experiment Videos

Hopping between localized Floquet states in periodically driven quantum dots.

D M Basko1

  • 1The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34100 Trieste, Italy. basko@ictp.trieste.it

Physical Review Letters
|December 20, 2003
PubMed
Summary

Weak interactions in quantum dots can cause heating by enabling electrons to hop between localized states. This electronic heating eventually overcomes quantum interference, destroying the localization effect and allowing energy absorption.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic systems

Background:

  • Quantum interference can suppress energy absorption in closed quantum dots.
  • Previous studies analyzed this phenomenon in the absence of electron-electron interactions.

Purpose of the Study:

  • To investigate the effect of weak electron-electron interactions on energy absorption and localization in quantum dots.
  • To analyze the heating dynamics and the transition from localized to delocalized states.

Main Methods:

  • Theoretical analysis of a closed quantum dot model.
  • Inclusion of weak electron-electron interactions.
  • Examination of energy absorption and localization phenomena.

Main Results:

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  • Weak interactions lead to finite energy absorption and heating.
  • Heating is associated with hopping between localized Floquet states.
  • The heating rate increases with electronic temperature, ultimately destroying localization.

Conclusions:

  • Electron-electron interactions are crucial for understanding energy absorption in quantum dots.
  • Heating provides a mechanism for overcoming quantum interference-induced localization.
  • The study reveals a transition from localized to delocalized states driven by electronic temperature.