Abstract
Many-particle effects in two-component systems composed of two types of oppositely charged fermions are studied. The influence of mass ratio of the particles on physical properties of microscopic electron–hole droplets is investigated. We offer a theoretical model describing a quantum-mechanical system of a finite number of electron–hole pairs coupled by Coulomb interaction. The model is based on the Hartree–Fock approximation and the Random Phase Approximation with Exchange (RPAE). Within our theoretical approach we exclude center-of-mass motion from the spectrum of excited states of the system. Using our model we calculate the binding energies, static dipole polarizabilities and photoabsorption cross sections for the systems containing different numbers of particles with various ratios of electron and hole masses.
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