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Anomalous Acoustocurrent within Quantum Hall Plateaus.

Renfei Wang1, Xiao Liu1, Mengmeng Wu1

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This summary is machine-generated.

We investigated acoustocurrent in quantum Hall systems using surface acoustic waves. We observed unique current spikes on quantum Hall plateaus, revealing insights into quasiparticle and quasihole behavior.

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Area of Science:

  • Condensed Matter Physics
  • Mesoscopic Physics
  • Quantum Transport

Background:

  • Two-dimensional electron systems (2DES) exhibit complex behaviors under strong magnetic fields.
  • Quantum Hall regimes (integer and fractional) are characterized by quantized Hall resistance.
  • Acoustic waves can interact with electron systems, influencing conductivity and inducing currents.

Purpose of the Study:

  • To systematically study the acoustocurrent in 2DES within integer and fractional quantum Hall regimes.
  • To differentiate between acoustic scattering and acoustic drag effects.
  • To investigate the behavior of drag current concerning electron system compressibility and quantum Hall states.

Main Methods:

  • Utilizing surface acoustic waves (SAWs) to probe 2DES.
  • Applying varying acoustic power levels.
  • Analyzing the resulting acoustocurrent and its dependence on magnetic field and electron density.

Main Results:

  • Successfully separated acoustic scattering and drag phenomena.
  • Observed a finite drag current in compressible phases and minima in incompressible quantum Hall states.
  • Discovered anomalously large bipolar spikes in drag current within quantum Hall plateaus.
  • Found that current peaks vanish linearly with reduced acoustic power in compressible phases.
  • Noted polarity reversal of current peaks at the edges of integer and fractional fillings.

Conclusions:

  • The observed acoustocurrent behavior provides a sensitive probe of electronic states in quantum Hall systems.
  • The bipolar spikes are consistent with the charge of quasiparticles and quasiholes in fractional quantum Hall states.
  • Acoustic drag can be a powerful tool to study the electronic properties and excitations of 2D electron systems.