Models of coherent exciton condensation

Abstract

That excitons in solids might condense into a phase-coherent ground state was proposed about 40 years ago, and has been attracting experimental and theoretical attention ever since. Although experimental confirmation has been hard to come by, the concepts released by this phenomenon have been widely influential. This tutorial review discusses general aspects of the theory of exciton and polariton condensates, focussing on the reasons for coherence in the ground state wavefunction, the BCS to Bose crossover(s) for excitons and for polaritons, and the relationship of the coherent condensates to standard lasers.

27 pages, 6 figures. Submitted for a special issue of J. Phys. Cond. Matt. associated with the EU network "Photon-mediated phenomena in semiconductor nanostructures"

References in corpus (2)

• Angular distribution of photoluminescence as a probe of Bose Condensation of trapped excitons
• Phase locking in quantum and classical oscillators: polariton condensates, lasers, and arrays of Josephson junctions

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• Collective coherence in planar semiconductor microcavities
• On the possibility of an excitonic insulator at the semiconductor-semimetal transition
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• Coherence Length of Cold Exciton Gases in Coupled Quantum Wells
• Cooper pairing of electrons and holes in graphene bilayer: Correlation effects
• Mean field theory and fluctuation spectrum of a pumped, decaying Bose-Fermi system across the quantum condensation transition
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• Atypical BCS-BEC crossover induced by quantum-size effects
• Numerical time propagation of quantum systems in radiation fields
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• A New Era of Excitonic Insulators
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• Condensation of electron-hole pairs in a degenerate semiconductor at room temperature
• Fermions in optical lattices near a Feshbach resonance: from band insulator to Mott insulator
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• Electrical Breakdown of Excitonic Insulator
• Electrical Control of Two-Dimensional Electron-Hole Fluids in the Quantum Hall Regime
• Interlayer excitonic insulator in two-dimensional double-layer semiconductor junctions: An explicitly solvable model
• Quantum Oscillation in Excitonic Insulating Electron-Hole Bilayer
• DMRG study of exciton condensation in the extended Falicov-Kimball model
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