Electron tunnelling in [formula omitted] double barrier structures

Pump and probe nonlinear transmission experiments with femtosecond resolution are used to investigate electron tunnelling between the central CdMnTe well and the outer CdTe wells of a CdTeCdMnTe double barrier structure. The time dependence of the reduction in oscillator strength resulting from band...

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Bibliographic Details
Published in:Journal of crystal growth 1996-02, Vol.159 (1-4), p.818-821
Main Authors: Cain, N., O'Neill, M., Nicholls, J.E., Piorek, T., Hagston, W.E., Chen, P., Chalk, S., Ashenford, D.E., Langley, A.J., Taday, P.F.
Format: Article
Language:English
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Summary:Pump and probe nonlinear transmission experiments with femtosecond resolution are used to investigate electron tunnelling between the central CdMnTe well and the outer CdTe wells of a CdTeCdMnTe double barrier structure. The time dependence of the reduction in oscillator strength resulting from bandfilling at the exciton resonance is used to measure population changes in the outer wells. A tunnelling time of 8 ps is measured when a carrier density of 1 × 1013cm−2 is used. Monte Carlo simulations show that the timescale of tunnelling via LO phonon scattering is 10 ps. A pump induced increase in absorption at energies smaller than that of the exciton resonance is observed at early times and assigned to band-gap renormalisation.
ISSN:0022-0248
1873-5002
DOI:10.1016/0022-0248(95)00701-6