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Finite-temperature density instability at high landau level occupancy

Stanescu1, Martin, Phillips

  • 1Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1100 W. Green Street, Urbana, Illinois 61801-3080, USA.

Physical Review Letters
|October 4, 2000
PubMed
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Disorder suppresses charge density wave melting temperature to zero in quantum Hall systems. Stripe orientation transitions with electron gas thickness, aligning with experimental observations.

Area of Science:

  • Condensed matter physics
  • Quantum Hall effect phenomena
  • Charge density wave instabilities

Background:

  • Quantum Hall systems exhibit complex behaviors at finite temperatures.
  • Charge density waves (CDWs) are sensitive to system parameters like disorder and magnetic fields.
  • Understanding CDW onset is crucial for characterizing quantum Hall states.

Purpose of the Study:

  • Investigate the onset of charge density wave instabilities in quantum Hall systems.
  • Analyze the influence of disorder and in-plane magnetic fields on CDW behavior.
  • Determine the critical conditions for CDW melting and stripe orientation transitions.

Main Methods:

  • Theoretical study of quantum Hall systems at finite temperature.
  • Analysis of Landau level filling nu>4.

Related Experiment Videos

  • Inclusion of disorder effects and in-plane magnetic fields.

    • Main Results:

    • Disorder suppresses the charge density wave melting temperature to absolute zero beyond a critical threshold.
    • A transition in stripe orientation (perpendicular to parallel) occurs when electron gas thickness exceeds ~60 Å.
    • Perpendicular stripe alignment correlates with experimental findings on easy conduction direction.

    Conclusions:

    • Disorder plays a critical role in stabilizing or destabilizing charge density waves in quantum Hall systems.
    • Electron gas thickness and in-plane magnetic fields dictate the emergent stripe phases.
    • The study provides a theoretical framework consistent with experimental observations in quantum Hall systems.