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We studied phonon modes propagating along the [311] direction in highly ordered, stacked InAs QDs embedded in an InGaAlAs matrix grown on InP(311) substrate by Raman spectroscopy. The Raman spectra showed clear doublets of folded quasi-longitudinal modes which have mixed transverse and longitudinal character. A broad feature observed in the Raman spectra was attributed to superposition of densely...
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