Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 32: Spintronics

HL 32.6: Vortrag

Mittwoch, 3. April 2019, 16:30–16:45, H33

Long-lived photon echoes from localized trions and donor-bound excitons in CdTe/(Cd,Mg)Te quantum well — •Alexander Kosarev^1,3, Sergey Poltavtsev^1,2, Ilya Akimov^1,3, Leonid Golub³, Mikhail Glazov³, Grzegorz Karczewski⁴, Maciej Wiater⁴, Tomasz Wojtowicz^4,5, Matthias Salewski¹, Nikolai Kozyrev³, Evgeny Zhukov¹, Dmitri Yakovlev^1,3, and Manfred Bayer^1,3 — ¹TU Dortmund, Dortmund, Germany — ²Spin Optics Laboratory, St. Petersburg University, St. Peterburg, Russia — ³Ioffe Institute, St. Petersburg, Russia — ⁴Institute of Physics, Polish Academy of Sciences, Warsaw, Poland — ⁵International Research Centre MagTop, Warsaw, Poland

We perform time-resolved photon echo and pump-probe Kerr-rotation spectroscopy on molecular-beam epitaxy-grown single 20 nm CdTe/(Cd,Mg)Te quantum well at low temperatures under resonant excitation of donor-bound excitons and trions. We observe spin precession of donor-bound electrons and electrons localized at potential fluctuations in the applied transverse magnetic field through the dynamics of the stimulated three-pulse photon echo and pump-probe ellipticity signals. Spectral dependences of the homogeneous and inhomogeneous spin phase relaxation times by means of both techniques are obtained. Theoretical model, which takes into account different spin dephasing mechanisms including electron hopping, is developed.