Nonequilibrium condensates and lasers without inversion: Exciton-polariton lasers
1996; American Physical Society; Volume: 53; Issue: 6 Linguagem: Inglês
10.1103/physreva.53.4250
ISSN1538-4446
AutoresA. Imamog ̄lu, Rajeev J. Ram, Stanley Pau, Y. Yamamoto,
Tópico(s)Semiconductor Quantum Structures and Devices
ResumoWe analyze elementary properties of exciton and polariton lasers --- devices that generate coherent optical and matter waves using final-state stimulation of exciton-phonon scattering. First we discuss the relation between the conditions for the onset of equilibrium and nonequilibrium excitonic condensates. Provided that the thermal de Broglie wavelength ${\ensuremath{\lambda}}_{\mathit{T}}$ exceeds the exciton Bohr radius ${\mathit{a}}_{\mathit{B}}$, an exciton laser operates without electronic population inversion. In contrast to previous proposals, this is a different type of laser without inversion which utilizes many-body coherences. When the excitonic character of the polariton branch vanishes, a polariton laser becomes indistinguishable from a photon laser. \textcopyright{} 1996 The American Physical Society.
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