Time-resolved studies of single quantum dots in magnetic fields

Stevenson, R M and Young, R J and See, P and Faffer, I and Ritchie, D A and Shields, A J (2004) Time-resolved studies of single quantum dots in magnetic fields. Physica E: Low-dimensional Systems and Nanostructures, 21 (2-4). pp. 381-384. ISSN 1386-9477

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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.

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Journal Article
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Physica E: Low-dimensional Systems and Nanostructures
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07 Jun 2012 11:55
Last Modified:
20 Sep 2023 00:21