Femtosecond Dynamics of Neutral and Charged Exciton Absorption in Cd_{1-x}Mn_xTe Quantum Well

• Authors: P. Płochocka , P. Kossacki , W. Maślana , C. Radzewicz , J. Gaj , J. Cibert , S. Tatarenko
• Languages of publication: EN

Abstracts

EN

We present a study of time-dependent transmission spectra of a modulation-doped Cd_{1-x}Mn_xTe/Cd_{1-y-z}Zn_yMg_zTe quantum well with variable hole gas concentration. We study the influence of pump pulses on excitonic absorption in subpicosecond time scale. A spectrally broad probe pulse of duration of 40 femtoseconds was used to record the absorption spectra at controlled delay. Studies of temporal evolution of exciton energies revealed coherence decay of linearly polarized excitons and thermalization of non-equilibrium exciton states. We found that a characteristic timescale for thermalization of non-equilibrium populations of photocreated excitons is between 0.8 and 3.6 ps. The timescale of this process depends on the hole concentration in quantum well: for higher hole concentration the decay is faster. Long-lived photo-induced magnetization accompanied by heating of the magnetic system was also observed.

Keywords

EN

78.40.Fy; 78.47.+p; 78.67.De

Discipline

• 78.67.De: Quantum wells
• 78.40.Fy: Semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2002
• Volume: 102
• Issue: 4-5
• Pages: 679-686

Dates

published

2002-10/11

received

2002-06-07

Contributors

author

P. Płochocka

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

P. Kossacki

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

W. Maślana

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

C. Radzewicz

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

J. Gaj

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

J. Cibert

• Laboratoire de Spectrométrie Physique, CNRS et Université Joseph Fourier - Grenoble, B.P. 87, 38402 Saint Martin d'Heres Cedex, France

author

S. Tatarenko

• Laboratoire de Spectrométrie Physique, CNRS et Université Joseph Fourier - Grenoble, B.P. 87, 38402 Saint Martin d'Heres Cedex, France

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Identifiers

DOI

10.12693/APhysPolA.102.679