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Interlayer tunneling in double-layer quantum hall pseudoferromagnets.

L Balents1, L Radzihovsky

  • 1Physics Department, University of California, Santa Barbara, 93106, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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Interlayer tunneling in double-layer quantum Hall states shows complex behavior. A magnetic field reveals a feature measuring the Goldstone mode dispersion, crucial for understanding symmetry breaking.

Area of Science:

  • Condensed Matter Physics
  • Quantum Hall Effect

Background:

  • Double-layer quantum Hall states exhibit complex interlayer tunneling.
  • Understanding the interplay of system parameters is key to characterizing these states.

Purpose of the Study:

  • To investigate the interlayer tunneling current-voltage (I-V) characteristics in double-layer quantum Hall states.
  • To explore the influence of various physical parameters on tunneling behavior.
  • To utilize in-plane magnetic fields to probe fundamental properties of the system.

Main Methods:

  • Analysis of interlayer tunneling current-voltage (I-V) characteristics.
  • Theoretical modeling considering sample size, voltage length scale, screening, disorder, and thermal lengths.
  • Application of in-plane magnetic fields to observe spectral features.

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Main Results:

  • Observed rich I-V behavior dependent on multiple physical parameters.
  • Predicted negative differential conductance with a power-law shape and a zero-bias peak for weak tunneling.
  • Demonstrated that an in-plane magnetic field splits the zero-bias peak into a "derivative" feature.

Conclusions:

  • The "derivative" feature provides a direct measurement of the Goldstone mode dispersion.
  • This measurement is linked to the spontaneous symmetry breaking of the double-layer Hall state.
  • The study offers insights into the fundamental physics of correlated electron systems in quantum Hall regimes.