Temperature dependence of dynamic nuclear polarization and its effect on electron spin relaxation and dephasing in InAs/GaAs quantum dots
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 14, 143105- p.Article in journal (Refereed) Published
Electron spin dephasing and relaxation due to hyperfine interaction with nuclear spins is studied in an InAs/GaAs quantum dot ensemble as a function of temperature up to 85 K, in an applied longitudinal magnetic field. The extent of hyperfineinduced dephasing is found to decrease, whereas dynamic nuclear polarization increases with increasing temperature. We attribute both effects to an accelerating electron spin relaxation through phonon-assisted electron-nuclear spin flip-flops driven by hyperfine interactions, which could become the dominating contribution to electron spin depolarization at high temperatures.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012. Vol. 100, no 14, 143105- p.
Natural Sciences Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-75095DOI: 10.1063/1.3701273ISI: 000302567800060OAI: oai:DiVA.org:liu-75095DiVA: diva2:503746
funding agencies|Swedish Research Council| 621-2011-4254 |2012-02-162012-02-162013-10-02Bibliographically approved