8 February 2007 Spin-dependent dynamics of individual CdTe/ZnTe quantum dot states studied by correlation spectroscopy
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Abstract
This work is devoted to correlation spectroscopy of individual II-VI CdTe/ZnTe QDs in view to determine non-resonant excitation mechanisms and provide information on spin relaxation of QD states. Second order photon autocorrelations and cross-correlations were measured in a Hanbury-Brown and Twiss setup for neutral and charged exciton and biexciton transitions, excited by pulses of a frequency-doubled femtosecond Ti:Sapphire laser. Some of the measurements were circular- or linear polarization resolved and performed in magnetic field. Besides, measurements of photoluminescence excited by pairs of laser pulses revealed fast excitation phenomena in the range of tens of ps. The results of measurements without polarization resolution were interpreted using a simple rate equation model and allowed us to establish the dominant role of single carrier capture in the non-resonant excitation of the QD. Polarization-dependent correlation measurements were used to study the magnetic field controlled transition between anisotropic QD exciton eigenstates active in linear polarization and those active in circular polarization. The same measurements provided information on spin relaxation of the carriers left in the dot after charged exciton recombination.
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J. Suffczyński, J. Suffczyński, T. Kazimierczuk, T. Kazimierczuk, M. Goryca, M. Goryca, B. Piechal, B. Piechal, A. Trajnerowicz, A. Trajnerowicz, K. Kowalik, K. Kowalik, P. Kossacki, P. Kossacki, A. Golnik, A. Golnik, K. P. Korona, K. P. Korona, M. Nawrocki, M. Nawrocki, J. A. Gaj, J. A. Gaj, G. Karczewski, G. Karczewski, "Spin-dependent dynamics of individual CdTe/ZnTe quantum dot states studied by correlation spectroscopy", Proc. SPIE 6471, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV, 64710F (8 February 2007); doi: 10.1117/12.709122; https://doi.org/10.1117/12.709122
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