Polaronic exciton in a parabolic quantum dot

Autor:	R. T. Senger, K. K. Bajaj
Rok vydání:	2003
Předmět:	Potential well Condensed matter physics Chemistry Oscillator strength Quantum dot Phonon Exciton Interaction energy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Ground state Biexciton Electronic Optical and Magnetic Materials
Zdroj:	physica status solidi (b). 236:82-89
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.200301514
Popis:	A calculation of the variations of the energy and oscillator strength of the ground state of an exciton in an ionic quantum dot as a function of the dot size, using a parabolic confining potential and a variational approach, is presented. The strong exciton – phonon interaction is taken into account by using an effective potential between the electron and the hole as derived by Pollmann and Buttner. The values of the exciton binding energies calculated using this potential are compared with those obtained using statically screened Coulomb potential and are found to be considerably larger for all values of the quantum dot size. In small quantum dots, the electron – hole correlation is reduced as the single particle energies scale at a much faster rate than the interaction energy. This is manifested in the behavior of oscillator strength, which becomes less dependent on the form of the effective interaction as the quantum dot size is reduced.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a3781d9b5757972cd0fc542fd59a1180 https://doi.org/10.1002/pssb.200301514 Zobrazit plný text záznamu Plný text