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Unequal layer densities in bilayer Wigner crystal at high magnetic fields

Author(s): Wang, Zhihai; Chen, Yong P; Zhu, Han; Engel, LW; Tsui, DC; et al

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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.
Publication Date: May-2012
Electronic Publication Date: 4-May-2012
Citation: Wang, Zhihai, Chen, Yong P, Zhu, Han, Engel, LW, Tsui, DC, Tutuc, E, Shayegan, M. (2012). Unequal layer densities in bilayer Wigner crystal at high magnetic fields. Physical Review B, 85 (19), 10.1103/PhysRevB.85.195408
DOI: doi:10.1103/PhysRevB.85.195408
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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