Zero field Wigner crystal |
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Authors: | Email author" target="_blank">R?ChitraEmail author T?Giamarchi |
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Institution: | (1) Laboratoire de Physique Theorique des Liquides, UMR 7600, Universite de Pierre et Marie Curie, Jussieu, 75005 Paris, France;(2) University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva, Switzerland |
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Abstract: | A candidate for the insulating phase of the 2D electron gas, seen
in high mobility 2D MOSFETS and heterojunctions, is a Wigner
crystal pinned by the incipient disorder. With this in view, we
study the effect of collective pinning on the physical properties
of the crystal formed in zero external magnetic field. We use an
elastic theory to describe to long wavelength modes of the
crystal. The disorder is treated using the standard Gaussian
variational method. We calculate various physical properties of
the system with particular emphasis on their density dependence.
We revisit the problem of compressibility in this system and
present results for the compressibility obtained via effective capacitance measurements in
experiments using bilayers. We present results for
the dynamical conductivity, surface acoustic wave anomalies and
the power radiated by the crystal through phonon emission at
finite temperatures. |
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Keywords: | |
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