Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)

TT 23.14: Vortrag

Montag, 16. März 2015, 18:30–18:45, H 1012

Intrinsic resonances in the Mn spin system of ZnMnSe quantum wells — •Janina Rautert¹, Jörg Debus¹, Vitalii Yu. Ivanov², Sergey M. Ryabchenko³, Andrei A. Maksimov⁴, Dmitri R. Yakovlev^1,5, and Manfred Bayer^1,5 — ¹Experimentelle Physik 2, TU Dortmund, Dortmund, Germany — ²Institute of Physics, Warsaw, Poland — ³Institute of Physics, Kiev, Ukraine — ⁴Institute of Solid State Physics, Chernogolovka, Russia — ⁵Ioffe Physical-Technical Institute, St. Petersburg, Russia

Diluted magnetic semiconductors (DMS) are regarded as model structures for new types of spin electronic devices aiming at the control of the spin degree of freedom of the carriers. Although it is known that the spin-lattice interaction of the localized Mn spins is strongly accelerated by the concentration of these spins [1], a comprehensive understanding of the real mechanism of this acceleration is still missing. We observe in the stationary and time-resolved giant Zeeman energy of the exciton in ZnMnSe quantum wells a number of minima around specific magnetic fields below 10 T. These minima depend on the optical power and Mn concentration; the photoluminescence linewidth and amplitude are also affected. We propose that at these magnetic fields the levels of excited single Mn ions and quick-relaxing antiferromagnetically coupled pairs of Mn ions have anti-crossings, thus providing highly efficient magnetization relaxation. These novel results shall contribute to the understanding of spin interactions within the Mn spin system in II-VI DMS structures. [1] J. Debus et al., Phys. Rev. B 82, 085448 (2010).