Rotons in a hybrid Bose-Fermi system

Abstract

We calculate the spectrum of elementary excitations in a two-dimensional exciton superfluid in the vicinity of a two-dimensional electron gas. We show that attraction of excitons due to their scattering with free electrons may lead to formation of a roton minimum. The energy of this minimum may go below the ground state energy which manifests breaking of the superfluidity. The Berezinsky-Kosterlitz-Thouless phase transition temperature decreases due to the exciton-exciton attraction mediated by electrons.

Revised version with parameters of realistic GaAs double quantum well, accepted for publication in Phys. Rev. Lett

References in corpus (7)

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• Exciton supersolidity in hybrid Bose-Fermi systems
• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Interactions mediated by atoms, photons, electrons, and excitons
• Roton-maxon spectrum and instability for weakly interacting dipolar excitons in a semiconductor layer
• Magnetoplasmon Fano resonance in Bose-Fermi mixtures
• Light-induced topological superconductivity in transition metal dichalcogenide monolayers
• Coulomb drag of excitons in Bose-Fermi mixtures
• Thermodynamic stability, compressibility matrix, and effects of mediated interactions in a strongly-interacting Bose-Fermi mixture
• Elementary excitations in spinor polariton- electron systems
• Coupled system of electrons and exciton-polaritons: Screening, dynamical effects, and superconductivity
• Coherent interactions between phonons and exciton or exciton-polariton condensates
• Analytic model of effective screened Coulomb interactions in a multilayer system
• Feshbach Resonances in Exciton-Charge-Carrier Scattering in Semiconductor Bilayers
• Striped excitonic (super)solid in anisotropic semiconductors with screened exciton interactions
• Functional-renormalization-group approach to strongly coupled Bose-Fermi mixtures in two dimensions
• BCS pairing in fully repulsive fermion mixtures
• Elementary excitations in the hybrid Bose-Fermi system induced by circularly polarized light in a two-dimensional gas of charge carriers with different masses