Unequal Layer Densities in Bilayer Wigner Crystal at High Magnetic Field

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 [Zhihai Wang et al., Phys. Rev. Lett. 136804 (2007)], which was ascribed to a one-component, pseudospin ferromagnetic Wigner solid. The evolution of the resonance frequency and line width indicates the quantum interlayer coherence survives at moderate density imbalance, but disappears when imbalance is sufficiently large.

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Cited by in corpus (7)

• Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well
• Charge-density-wave states in double-layer graphene structures in a high magnetic field
• Pinning modes of high magnetic field Wigner solids with controlled alloy disorder
• Wigner solid pinning modes tuned by fractional quantum Hall states of a nearby layer
• The asymmetric Wigner bilayer
• Wigner solids of wide quantum wells near Landau filling $\nu =1$
• Defect liquids in a weakly imbalanced bilayer Wigner Crystal