Hydrostatic pressure coefficients of the photoluminescence of InAs/GaAs quantum dots

Autor:	Xurong Chen, N.Y. Tang, W. J. Lu
Rok vydání:	2005
Předmět:	Physics Condensed Matter::Materials Science Photoluminescence Condensed matter physics Quantum dot Band gap Lattice (order) Hydrostatic pressure General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Computer Science::Operating Systems Nonlinear elasticity
Zdroj:	Physics Letters A. 336:434-439
ISSN:	0375-9601
DOI:	10.1016/j.physleta.2005.01.051
Popis:	There is a significant diminution in the hydrostatic pressure coefficients (PCs) of the photoluminescence spectrum for InAs/GaAs quantum dots in comparison with that of bulk binary. We study this phenomenon with the nonlinear elasticity theory. The variation of the lattice and elastic constants plays an important role in the change of PCs, which causes the obvious decrease of the built-in strains of InAs/GaAs quantum dots under the hydrostatic pressure. The decrease will induce the novel change of the energy gap and the electronic confined energy. Finally, the change is shown in the measured small PCs of photoluminescence from quantum dots. Also the calculation reveals that the PCs are sensitive to the sizes of quantum dots because of the change of the electronic confined energy. The smaller the quantum dot is, the stronger the influence of this change on the PCs becomes. This effect gives rise to the increase of PCs when dot size is reduced.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4d39c9d1370b46b6da9f588baa7cac7f https://doi.org/10.1016/j.physleta.2005.01.051 Zobrazit plný text záznamu Full Text from ScienceDirect