Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.28: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Optical orientation of hole magnetic polarons in (Cd,Mg)Te/(Cd,Mn,Mg)Te quantum wells — •Erik Kirstein¹, Evgeny A. Zhukov¹, Yuri G. Kusrayev², Kirill. V. Kavokin^2,3, Dmitri R. Yakovlev^1,2, Jörg Debus¹, Alexander Schwan¹, Ilya A. Akimov^1,2, Grzegorz Karczewski⁴, Tomasz J. Wojtowicz⁴, Jacek Kossut⁴, and Manfred Bayer¹ — ¹Experimentelle Physik 2, Technische Universit\"at Dortmund, 44221 Dortmund, Germany — ²Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ³Spin Optics Laboratory, St. Petersburg State University, 198504 St. Petersburg, Russia — ⁴Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland

The hole magnetic polaron (HMP) formation was investigated in a CdMnTe diluted magnetic semiconductor quantum well structure. The HMP is formed by the anisotropic exchange field of holes along the sample growth axis acting on free Mn Spins. The HMP occurs as a long living non oscillating contribution to the Kerr rotation Pump Probe signal, with observed dephasing times up to 60 ns. The HMP polaron is analyzed in dependence of the magnetic field, the lattice temperature and different carrier concentrations. Moreover, the full picture of the investigated QW structures show clear dynamics of hole, Mn and high effective g-factor electron spins. One obtains a detailed view on the theory of the HMP formation and relaxation. With the heavy hole as the dominant factor of HMP complex, a potential barrier is introduced to explain the HMP relaxation.