Study of phonons in self-assembled InAs quantum dots embedded in an InGaAlAs matrix
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- 作者：Yukiko Kamikawa-Shimizu ; Robert Patterson ; Alex ; er Milekhin ; Kouichi Akahane ; Yasushi Shoji ; Dietrich R.T. Zahn ; Yoshitaka Okada ; Gavin Conibeer
- 关键词：Phonon gap ; Self assembled QDs ; Dispersion curve ; Folded acoustic phonon ; Raman spectroscopy ; Sound velocity
- 刊名：Physica E
- 出版年：March, 2014
- 年：2014
- 卷：57
- 期：Complete
- 页码：1-5
- 全文大小：1525 K
文摘
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.