Photoluminescence of tetrahedral quantum-dot quantum wells

Details Photoluminescence of tetrahedral quantum-dot quantum wells Photoluminescence of tetrahedral quantum-dot quantum wells

2004-01-30

arxiv.org/abs/cond-mat/0401651v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, E-mail addresses: vladimir@ee.ucr.edu, ep@pokatilov.moldline.net, vladimir.fomin@ua.ac.be, jozef.devreese@

Scientific paper

10.1103/PhysRevLett.92.127402

Taking into account the tetrahedral shape of a quantum dot quantum well (QDQW) when describing excitonic states, phonon modes and the exciton-phonon interaction in the structure, we obtain within a non-adiabatic approach a quantitative interpretation of the photoluminescence spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast to the dark ground state for a spherical QDQW. The position of the phonon peaks in the photoluminescence spectrum is attributed to interface optical phonons. We also show that the experimental value of the Huang-Rhys parameter can be obtained only within the nonadiabatic theory of phonon-assisted transitions.

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