Exciton lifetimes of CdTe nanocrystal quantum dots in high magnetic fields

J. H. Blokland, V. I. Claessen, F. J. P. Wijnen, E. Groeneveld, C. de Mello Donegá, D. Vanmaekelbergh, A. Meijerink, J. C. Maan, and P. C. M. Christianen

Phys. Rev. B 83, 035304 – Published 11 January 2011

Abstract

We have measured the low-temperature (4.2 K) exciton lifetimes of zinc-blende CdTe nanocrystal quantum dots (NQDs), 2.6–3.8 nm in diameter, in magnetic fields up to 30 T. The exciton photoluminescence decay time decreases with both dot size and magnetic field. We explain the decrease in decay time in magnetic fields by the mixing of bright and dark exciton states due to a small shape asymmetry in the zinc-blende CdTe NQDs. We show that this behavior resembles that of wurtzite CdSe NQDs, and we demonstrate that an asymmetry of NQDs caused by either shape or crystal structure leads to similar exciton decay dynamics.

Received 8 April 2010

DOI:https://doi.org/10.1103/PhysRevB.83.035304

Authors & Affiliations

J. H. Blokland¹, V. I. Claessen², F. J. P. Wijnen¹, E. Groeneveld³, C. de Mello Donegá³, D. Vanmaekelbergh³, A. Meijerink³, J. C. Maan¹, and P. C. M. Christianen^1,*

¹Radboud University Nijmegen, Institute for Molecules and Materials, High Field Magnet Laboratory, NL-6525 ED Nijmegen, The Netherlands
²Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 ED Nijmegen, The Netherlands
³Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, NL-3508 TA Utrecht, The Netherlands

^*p.christianen@science.ru.nl

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Vol. 83, Iss. 3 — 1 January 2011

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