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Band-gap renormalization in InP/GaxIn1-xP quantum dots

AuthorsNowak, A. K.; Gallardo, E.; Meulen, H. P. van der; Calleja, J. M.; Ripalda, José María ; González Sotos, Luisa ; González Díez, Yolanda
Issue Date28-Jun-2011
PublisherAmerican Physical Society
CitationPhysical Review B 83(24): 245447 (2011)
AbstractA continuous and systematic red shift of the exciton emission energy in small InP/InGaP quantum dots is observed for increasing excitation energies and intensities. Superposed on this red shift, emission energy minima appear which show a one-to-one correspondence to emission intensity maxima as a function of the excitation energy. This band-gap renormalization is attributed to the hybridization of the quantum dot excited states with the wetting layer continuum. Polarization-resolved measurements reveal that the exciton fine structure splitting can be tuned up to 10% in the present case by changing the excitation energy. Possible implications of the present results on the development of entangled photon pair sources are discussed.
Description5 figuras, 5 páginas.-- PACS number(s): 78.67.Hc, 78.55.Cr
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.83.245447
Appears in Collections:(IMN-CNM) Artículos
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