On the Coulomb-dipole transition in mesoscopic classical and quantum electron-hole bilayers

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 the characteristic in-layer distances. An analysis of the classical ground state configurations for harmonically confined clusters with $N\le 30$ reveals that the energetically most favorable state can differ from that of two-dimensional pure dipole or Coulomb systems. Performing a normal mode analysis for the N=19 cluster it is found that the lowest mode frequencies exhibit drastic changes when $d$ is varied. Furthermore, we present quantum-mechanical ground states for N=6, 10 and 12 spin-polarized electrons and holes. We compute the single-particle energies and orbitals in self-consistent Hartree-Fock approximation over a broad range of layer separations and coupling strengths between the limits of the ideal Fermi gas and the Wigner crystal.

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Cited by in corpus (8)

• Condensed Matter Theory of Dipolar Quantum Gases
• Strongly correlated gases of Rydberg-dressed atoms: quantum and classical dynamics
• Nonequilibrium Green's functions approach to strongly correlated few-electron quantum dots
• Transport properties of quantum dots in the Wigner molecule regime
• Nonequilibrium properties of strongly correlated artificial atoms - a Green's functions approach
• Mesoscopic dipolar quantum crystals
• Effective interaction potential and superfluid-solid transition of spatially indirect excitons
• Nonequilibrium Green's function approach to the pair distribution function of quantum many-body systems out of equilibrium