Quantum opening of the Coulomb gap in two dimensions

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For a constant density of spinless fermions in strongly disordered two dimensional clusters, the energy level spacing between the ground state and the first excitation is studied for increasing system sizes. The average indicates a smooth opening of the gap when the Coulomb energy to Fermi energy ratio $r_s$ increases from 0 to 3, while the distribution exhibits a sharp Poisson-Wigner-like transition at $r_s \approx 1$. The results are related to the transition from Mott to Efros-Shklovskii hopping conductivity recently observed at a similar ratio $r_s$.
revtex, 4 pages, 4 figures

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Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/29167

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9903339
 http://arxiv.org/abs/cond-mat/9903339

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arXiv