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Time-resolved studies of single quantum dots in magnetic fields

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  • R M Stevenson
  • R J Young
  • P See
  • I Faffer
  • D A Ritchie
  • A J Shields
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<mark>Journal publication date</mark>1/03/2004
<mark>Journal</mark>Physica E: Low-dimensional Systems and Nanostructures
Issue number2-4
Volume21
Number of pages4
Pages (from-to)381-384
Publication statusPublished
Original languageEnglish
EventProceedings of the Eleventh International Conference on Modulation (MSS11) - Nara, Japan
Duration: 14/07/200318/07/2003

Conference

ConferenceProceedings of the Eleventh International Conference on Modulation (MSS11)
CountryJapan
CityNara
Period14/07/0318/07/03

Abstract

We present time-resolved and time-integrated spectroscopy of single InAs quantum dots grown in a GaAs matrix. We observe a number of interesting features in the spectra, including the zero field splitting of exciton and biexciton lines due to quantum dot asymmetry. By the application of an in-plane magnetic field, the normally optically active and inactive exciton states become mixed, enabling us to optically probe the normally inaccessible 'dark' states. Time resolved measurements on the mixed states show decay times several times longer than the exciton lifetime at zero field, which we show to be consistent with a dark exciton lifetime orders of magnitude longer than that for bright exciton.