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Related Experiment Videos

Tunneling through a coherent "Quantum antidot molecule"

Maasilta1, Goldman

  • 1Department of Physics, State University of New York, Stony Brook, New York 11794-3800, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary

We observed resonant tunneling in a fractional quantum Hall regime, revealing two coupled resonant states. This suggests a coherently coupled "antidot molecule" formed by quantum interference.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Mesoscopic Physics

Background:

  • The fractional quantum Hall effect (FQHE) describes highly correlated electron systems in two dimensions under strong magnetic fields.
  • Resonant tunneling phenomena are crucial for understanding electron transport in nanoscale devices.
  • Quantum antidots offer a unique platform to study electron interactions and quantum interference effects.

Purpose of the Study:

  • To investigate resonant tunneling through a quantum antidot within the fractional quantum Hall regime.
  • To analyze the nature and coupling of resonant states involved in the tunneling process.
  • To provide experimental evidence for coherent coupling between resonant states in such systems.

Main Methods:

  • Experimental measurements of electrical conductance through a quantum antidot.
  • Analysis of conductance peak envelopes to identify resonant states.
  • Comparison of tunneling rates with phase breaking rates to assess coherence.

Main Results:

  • Observed resonant tunneling through a quantum antidot in the FQHE regime.
  • Identified tunneling via two distinct resonant states: one on the antidot, another on a disorder-induced potential hill.
  • Determined that the coherent tunneling rate significantly exceeds the phase breaking rate.

Conclusions:

  • The experimental results provide strong evidence for a coherently coupled "antidot molecule" system.
  • Coherent tunneling between spatially separated resonant states is demonstrated.
  • This work deepens the understanding of quantum interference and electron correlations in mesoscopic systems.

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