Coherence Length of Excitons in a Semiconductor Quantum Well

Details Coherence Length of Excitons in a Semiconductor Quantum Well Coherence Length of Excitons in a Semiconductor Quantum Well

2002-07-07

arxiv.org/abs/cond-mat/0207184v2

Phys. Rev. Lett. 89, 097401 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 Pages, 4 figures

Scientific paper

10.1103/PhysRevLett.89.097401

We report on the first experimental determination of the coherence length of excitons in semiconductors using the combination of spatially resolved photoluminescence with phonon sideband spectroscopy. The coherence length of excitons in ZnSe quantum wells is determined to be 300 ~ 400 nm, about 25 ~ 30 times the exciton de Broglie wavelength. With increasing exciton kinetic energy, the coherence length decreases slowly. The discrepancy between the coherence lengths measured and calculated by only considering the acoustic phonon scattering suggests an important influence of static disorder.

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