Spherical quantum dot with added parabolic confinement as a nanoscale tunable radiation detector
2002 (English)In: Physica. E, Low-Dimensional systems and nanostructures, ISSN 1386-9477, E-ISSN 1873-1759, Vol. 15, no 1, 27-32 p.Article in journal (Refereed) Published
We have calculated the optical absorption matrix elements for a spherical silicon quantum dot embedded in silicon dioxide with the addition of a parabolic potential which is used to tune the bound state energy levels. The photon absorption from the ground state to the excited states was calculated as a function of the parabolic potential curvature constant and the dot radius which varied between 2 and 6 nm. The results show that we can tune the wavelength in the entire visible range. Furthermore, the absorption cross section was found to change by several orders of magnitude with increasing parabolic potential curvature constant. For large parabolic curvature constant the transition move out of the visible range, and the number of allowed transition increased with the dot radius.
Place, publisher, year, edition, pages
Elsevier Science B.V., Amsterdam. , 2002. Vol. 15, no 1, 27-32 p.
quantum dot; parabolic confinement; gates; radiation detector
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-59168DOI: 10.1016/S1386-9477(01)00493-3 |ISI: 000179317900005OAI: oai:DiVA.org:liu-59168DiVA: diva2:350173