First-order spatial coherence of excitons in planar nanostructures: a k-filtering effect

Details First-order spatial coherence of excitons in planar nanostructures: a k-filtering effect First-order spatial coherence of excitons in planar nanostructures: a k-filtering effect

2008-02-29

arxiv.org/abs/0802.4454v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.78.033306

We propose and analyze a k-filtering effect which gives rise to the drastic difference between the actual spatial coherence length of quasi-two-dimensional (quasi-2D) excitons or microcavity (MC) polaritons in planar nanostructures and that inferred from far-field optical measurements. The effect originates from the conservation of in-plane wavevector k in the optical decay of the particles in outgoing bulk photons. The k-filtering effect explains the large coherence lengths recently observed for indirect excitons in coupled quantum wells (QWs), but is less pronounced for MC polaritons at low temperatures, T<10K.

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