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dc.contributor.authorDusanowski, L.
dc.contributor.authorMusial, A.
dc.contributor.authorMarynski, A.
dc.contributor.authorMrowinski, P.
dc.contributor.authorAndrzejewski, J.
dc.contributor.authorMachnikowski, P.
dc.contributor.authorMisiewicz, J.
dc.contributor.authorSomers, A.
dc.contributor.authorHoefling, S.
dc.contributor.authorReithmaier, J. P.
dc.contributor.authorSek, G.
dc.identifier.citationDusanowski , L , Musial , A , Marynski , A , Mrowinski , P , Andrzejewski , J , Machnikowski , P , Misiewicz , J , Somers , A , Hoefling , S , Reithmaier , J P & Sek , G 2014 , ' Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures ' , Physical Review. B, Condensed matter and materials physics , vol. 90 , no. 12 , 125424 .
dc.descriptionJ.M. acknowledges the financial support from COPERNICUS Award of the Foundation for Polish Science (FNP) and Deutsche Forschungsgemeinschaft (DFG). The fellowship co-financed by the European Commission within European Social Fund is also acknowledged.en
dc.description.abstractThe influence of acoustic phonons on the emission spectra of quantum dashes (QDashes), that are quasi-zero-dimensional epitaxial nanostructures with significant shape anisotropy, is investigated both experimentally and theoretically. Photoluminescence (PL) spectra of single InAs/InGaAlAs/InP (001) QDashes exhibit sidebands of the main emission peak, clearly indicating the contribution of phonon-assisted emission to the exciton luminescence, which dominates the PL line shape at higher temperatures (between 50 and 100 K, usually). By utilizing the independent boson model we perform systematic and comprehensive studies of the influence of the overall geometry of quantum confinement on this spectral feature in an uncommon quantum system. A comparison of the experimental data and the results of modeling have confirmed the existence of two types of states differing in the spatial confinement and symmetry within one sample, i.e., typical for large elongated objects or characteristic for smaller and more symmetric structures. The latter are supposed to correspond to local widenings or zigzag bends present in some of the dashes and acting as additional localization centers, which confine excitons in a much smaller volume and decrease effectively the resulting in-plane anisotropy. Those observations evidence a nontrivial spatial character of the quantum confinement in these structures. They are consistent with our previous polarization-resolved study on the QDash ensemble and correlate well with the exciton decay times, and the spectral-diffusion-dominated line broadenings at low temperatures reflecting the effect of electric field fluctuations on the excitons of a different spatial extension. Finally, we demonstrate a pronounced suppression of phonon-induced decoherence for such strongly elongated nanostructures.
dc.relation.ispartofPhysical Review. B, Condensed matter and materials physicsen
dc.subjectQuantum-dash lasersen
dc.subjectOptical amplifiersen
dc.subjectQC Physicsen
dc.titlePhonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructuresen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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