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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

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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.201350201

@article{Kuhlen2014Unamb-53785, title={Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments}, year={2014}, doi={10.1002/pssb.201350201}, 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} }

Brandt, Martin S. de Winter, Robin 2021-05-28T07:51:47Z Kuhlen, Sebastian 2014 Attribution 3.0 Unported Gross, Rudolf Gross, Rudolf Opel, Matthias Unambiguous determination of spin dephasing times in ZnO by time-resolved magneto-optical pump-probe experiments 2021-05-28T07:51:47Z Kuhlen, Sebastian Brandt, Martin S. de Winter, Robin Althammer, Matthias Ledesch, Ralph Althammer, Matthias Wassner, Thomas A. Beschoten, Bernd Gönnenwein, Sebastian T. B. Wassner, Thomas A. 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 T<sub>2</sub><sup>*</sup> can easily be determined if their values are comparable to the available pump-probe-delays. If T<sub>2</sub><sup>*</sup> exceeds the laser repetition time, however, resonant spin amplification (RSA) can equally be used to extract T<sub>2</sub><sup>*</sup>. We demonstrate that in ZnO these techniques have several tripping hazards resulting in deceptive values for T<sub>2</sub><sup>*</sup> 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 T<sub>2</sub><sup>*</sup> of a single spin ensemble, while the two spin species have T<sub>2</sub><sup>*</sup> 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 T<sub>2</sub><sup>*</sup> values extracted from delay line scans, it results in seemingly shorter T<sub>2</sub><sup>*</sup> values in RSA. Ledesch, Ralph Gönnenwein, Sebastian T. B. eng Opel, Matthias Beschoten, Bernd

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