Stimulated scattering and lasing of intersubband cavity polaritons

Simone de Liberato (1, 2) , Cristiano Ciuti (1)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 LPA - Laboratoire Pierre Aigrain

We present a microscopic theory describing the stimulated scattering of intersubband polariton excitations in a microcavity-embedded two-dimensional electron gas. In particular, we consider the polariton scattering induced by the spontaneous emission of optical phonons. Our theory demonstrates the possibility of final-state stimulation for the scattering of such composite excitations, accounting for the deviations from perfect bosonicity occurring at high excitation densities. By using realistic parameters for a GaAs semiconductor system, we predict how to achieve a quantum degenerate regime, leading to ultralow threshold lasing without population inversion.

Domaines: Physique Quantique [quant-ph]; Autre [cond-mat.other]

Simone de Liberato, Cristiano Ciuti. Stimulated scattering and lasing of intersubband cavity polaritons. Physical Review Letters, 2009, 102, pp.136403. ⟨hal-00287084⟩