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Confinement sensitivity in quantum dot singlet-triplet relaxation
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0003-3444-1317
Number of Authors: 2
2017 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 29, no 45, 455302Article in journal (Refereed) Published
Abstract [en]

Spin-orbit mediated phonon relaxation in a two-dimensional quantum dot is investigated using different confining potentials. Elliptical harmonic oscillator and cylindrical well results are compared to each other in the case of a two-electron GaAs quantum dot subjected to a tilted magnetic field. The lowest energy set of two-body singlet and triplet states are calculated including spin-orbit and magnetic effects. These are used to calculate the phonon induced transition rate from the excited triplet to the ground state singlet for magnetic fields up to where the states cross. The roll of the cubic Dresselhaus effect, which is found to be much more important than previously assumed, and the positioning of 'spin hot-spots' are discussed and relaxation rates for a few different systems are exhibited.

Place, publisher, year, edition, pages
2017. Vol. 29, no 45, 455302
Keyword [en]
spin-orbit, spin relaxation, Dresselhaus coupling, phonons
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-148824DOI: 10.1088/1361-648X/aa8b34ISI: 000412946100001PubMedID: 28885192OAI: oai:DiVA.org:su-148824DiVA: diva2:1156754
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved

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