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Topological Defects, Multiparticle Exchange and Re-entrant Melting

Coherent quantum-mechanical climb motion of a dislocation pair involves exchanges of an array of particles. For electrons in a magnetic field this motion becomes possible near odd denominator filling factors, the pair is liberated and its energy is decreased, consistent with the lowering of the activation energy in recent transport measurements by Jiang et al. This decrease also provides a mechanism of re-entrant melting via spontaneous generation of dislocation pairs.