Two-phonon assisted exciton spin relaxation due to exchange interaction in spherical quantum dots

Simple item page
dc.creatorNahálková, P.
dc.creatorSprinzl, D.
dc.creatorMalý, P.
dc.creatorNěmec, P.
dc.creatorGladilin, V. N.
dc.creatorDevreese, J. T.
dc.date2007-09-26
dc.date.accessioned2026-07-07T08:32:21Z
dc.date.available2026-07-07T08:32:21Z
dc.descriptionSpin relaxation in undoped quasi-spherical CdS quantum dots at zero magnetic fields is investigated using time- and polarization-resolved transient absorption measurements. Unlike in previous studies of these systems, the measured signals were corrected for spin-insensitive contributions to the exciton bleaching dynamics, {allowing us to determine} the pure spin-related exciton dynamics. To explain the observed room-temperature spin-relaxation time of several nanoseconds, we propose a novel mechanism based on intralevel exciton transitions with the emission of one LO phonon, the absorption of another LO phonon, and an electron spin flip, which is driven by the electron-hole exchange interaction. The transition rates, calculated in the present work for different sizes of quantum dots and temperatures, are in fair agreement with our experimental results.
dc.description5 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0709.4168
dc.identifierhttp://arxiv.org/abs/0709.4168
dc.identifierPhys. Rev. B 75, 113306, 1-4 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.113306
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138770
dc.subjectMesoscale and Nanoscale Physics
dc.titleTwo-phonon assisted exciton spin relaxation due to exchange interaction in spherical quantum dots
dc.typetext

Files

Collections

arXiv