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Josephson effect without superconductivity: realization in quantum Hall bilayers.

M M Fogler1, F Wilczek

  • 1School of Natural Sciences, Institute for Advanced Study, Einstein Drive, Princeton, New Jersey 08540, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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A quantum Hall bilayer at total filling nu = 1 exhibits a flux flow regime, analogous to Josephson junctions. This may explain interlayer tunneling conductance peaks, controllable by magnetic fields.

Area of Science:

  • Condensed matter physics
  • Quantum Hall effect
  • Josephson junctions

Background:

  • Quantum Hall bilayers exhibit complex dynamics.
  • Interlayer tunneling conductance shows anomalous peaks.
  • Josephson junction flux flow is a well-studied phenomenon.

Purpose of the Study:

  • To propose a dynamical regime for quantum Hall bilayers.
  • To explain the observed peak in interlayer tunneling conductance.
  • To investigate the role of in-plane magnetic fields.

Main Methods:

  • Theoretical analysis of quantum Hall bilayer systems.
  • Analogy drawn with flux flow dynamics in Josephson junctions.
  • Investigation of spatiotemporal chaos and broadband noise.

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Main Results:

  • A quantum Hall bilayer with nu = 1 displays a dynamical regime analogous to Josephson junction flux flow.
  • This analogy potentially explains the conspicuous peak in interlayer tunneling conductance.
  • Flux flow is predicted to be spatiotemporally chaotic at low bias, leading to broadband noise.
  • The peak position is tunable via an in-plane magnetic field.

Conclusions:

  • The flux flow analogy provides a framework for understanding quantum Hall bilayer dynamics.
  • The proposed model accounts for experimental observations of interlayer tunneling conductance.
  • Control of quantum transport properties using magnetic fields is demonstrated.