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

Mouchliadis, Leonidas and Ivanova, Aneliya Vitanova 2008. First-order spatial coherence of excitons in planar nanostructures: A k-filtering effect. Physical Review B 78 (3) , 033306. 10.1103/PhysRevB.78.033306

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Abstract

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 excitons or microcavity polaritons in planar nanostructures and that inferred from far-field optical measurements. The effect originates from conservation of the in-plane wave-vector 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 but is less pronounced for microcavity polaritons at low temperatures, T≲10 K.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 18 Oct 2017 13:38
URI: http://orca.cf.ac.uk/id/eprint/7311

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