Study of phonons in self-assembled InAs quantum dots embedded in an InGaAlAs matrix

作者：Kamikawa Shimizu Yukiko^*; Patterson Robert; Milekhin Alexander; Akahane Kouichi; Shoji Yasushi; Zahn Dietrich R T; Okada Yoshitaka; Conibeer Gavin

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2014, 57: 1-5.

DOI：10.1016/j.physe.2013.10.023

• Phonon gap
• Self assembled QDs
• Dispersion curve
• Folded acoustic phonon
• Raman spectroscopy
• Sound velocity

We studied phonon modes propagating along the [3 1 1] direction in highly ordered, stacked InAs QDs embedded in an InGaAlAs matrix grown on InP(3 1 1) 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 folded and/or confined phonon modes that is with agreement with our previous theoretical calculation. The phonon gap was observed and compared with our theoretical calculations.

• 出版日期2014-3