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Collapse of Integer Hall Gaps in a Two-Dimensional Hole System

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In the integral quantum Hall regime, Wigner crystallization due to the Landau-level mixing is investigated in a two-dimensional hole system. By calculations of excitation energies, we show that Landau-level mixing effects can destroy the energy gap, which leads to an integral quantum Hall effect, at finite wave vector. Such a destruction of the energy gap at finite wave vector is interpreted as Wigner crystallization in a two-dimensional hole system.

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