On the Coulomb-dipole transition in mesoscopic classical and quantum electron-hole bilayers - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




On the Coulomb-dipole transition in mesoscopic classical and quantum electron-hole bilayers - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We study the Coulomb-to-dipole transition which occurs when the separation$d$ of an electron-hole bilayer system is varied with respect to thecharacteristic in-layer distances. An analysis of the classical ground stateconfigurations for harmonically confined clusters with $N\leq30$ reveals thatthe energetically most favorable state can differ from that of two-dimensionalpure dipole or Coulomb systems. Performing a normal mode analysis for the N=19cluster it is found that the lowest mode frequencies exhibit drastic changeswhen $d$ is varied. Furthermore, we present quantum-mechanical ground statesfor N=6, 10 and 12 spin-polarized electrons and holes. We compute thesingle-particle energies and orbitals in self-consistent Hartree-Fockapproximation over a broad range of layer separations and coupling strengthsbetween the limits of the ideal Fermi gas and the Wigner crystal.



Autor: P. Ludwig, K. Balzer, A. Filinov, H. Stolz, M. Bonitz

Fuente: https://arxiv.org/







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