Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments
Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments
Date
2014
Authors
Kuhlen, Sebastian
Ledesch, Ralph
de Winter, Robin
Althammer, Matthias
Opel, Matthias
Gross, Rudolf
Wassner, Thomas A.
Brandt, Martin S.
Beschoten, Bernd
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Physica Status Solidi (B) - Basic Solid State Physics ; 251 (2014), 9. - pp. 1861-1871. - Wiley-Blackwell. - ISSN 0370-1972. - eISSN 1521-3951
Abstract
Time-resolved magneto-optics is a well-established optical pump probe technique to generate and to probe spin coherence in semiconductors. By this method, spin dephasing times T2* can easily be determined if their values are comparable to the available pump-probe-delays. If T2* exceeds the laser repetition time, however, resonant spin amplification (RSA) can equally be used to extract T2*. We demonstrate that in ZnO these techniques have several tripping hazards resulting in deceptive values for T2* and show how to avoid them. We show that the temperature dependence of the amplitude ratio of two separate spin species can easily be misinterpreted as a strongly temperature dependent T2* of a single spin ensemble, while the two spin species have T2* values which are nearly independent of temperature. Additionally, consecutive pump pulses can significantly diminish the spin polarization, which remains from previous pump pulses. While this barely affects T2* values extracted from delay line scans, it results in seemingly shorter T2* values in RSA.
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530 Physics
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pump‐probe techniques, resonant spin amplification, spin dephasing, ZnO
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KUHLEN, Sebastian, Ralph LEDESCH, Robin DE WINTER, Matthias ALTHAMMER, Sebastian T. B. GÖNNENWEIN, Matthias OPEL, Rudolf GROSS, Thomas A. WASSNER, Martin S. BRANDT, Bernd BESCHOTEN, 2014. Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments. In: Physica Status Solidi (B) - Basic Solid State Physics. Wiley-Blackwell. 251(9), pp. 1861-1871. ISSN 0370-1972. eISSN 1521-3951. Available under: doi: 10.1002/pssb.201350201BibTex
@article{Kuhlen2014Unamb-53785, year={2014}, doi={10.1002/pssb.201350201}, title={Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments}, number={9}, volume={251}, issn={0370-1972}, journal={Physica Status Solidi (B) - Basic Solid State Physics}, pages={1861--1871}, author={Kuhlen, Sebastian and Ledesch, Ralph and de Winter, Robin and Althammer, Matthias and Gönnenwein, Sebastian T. B. and Opel, Matthias and Gross, Rudolf and Wassner, Thomas A. and Brandt, Martin S. and Beschoten, Bernd} }
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