Unequal layer densities in bilayer Wigner crystal at high magnetic fields

Zhihai Wang, Yong P. Chen, Han Zhu, L. W. Engel, D. C. Tsui, E. Tutuc, M. Shayegan

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We report studies of pinning mode resonances of magnetic field induced bilayer Wigner crystals of bilayer hole samples with negligible interlayer tunneling and different interlayer separations d, in states with varying layer densities, including unequal layer densities. With unequal layer densities, samples with large d relative to the in-plane carrier-carrier spacing a, two pinning resonances are present, one for each layer. For small d/a samples, a single resonance is observed even with significant density imbalance. These samples, at balance, were shown to exhibit an enhanced pinning mode frequency, which was ascribed to a one-component, pseudospin ferromagnetic Wigner solid. The evolution of the resonance frequency and linewidth indicates that the quantum interlayer coherence survives at moderate density imbalance, but disappears when imbalance is sufficiently large.

Original languageEnglish (US)
Article number195408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number19
DOIs
StatePublished - May 4 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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