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Spin dynamics of Mn...
Spin dynamics of Mn impurities and their bound acceptors in GaAs
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- Mahani, Mohammad Reza (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE)
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- Pertsova, Anna (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE)
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- Canali, Carlo M. (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE)
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 90:24
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https://urn.kb.se/re...
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Abstract
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- We present results of tight-binding spin-dynamics simulations of individual and pairs of substitutionalMn impurities in GaAs. Our approach is based on the mixed quantum-classical schemefor spin dynamics, with coupled equations of motions for the quantum subsystem, representing thehost, and the localized spins of magnetic dopants, which are treated classically. In the case ofa single Mn impurity, we calculate explicitly the time evolution of the Mn spin and the spins ofnearest-neighbors As atoms, where the acceptor (hole) state introduced by the Mn dopant resides.We relate the characteristic frequencies in the dynamical spectra to the two dominant energy scalesof the system, namely the spin-orbit interaction strength and the value of the p-d exchange couplingbetween the impurity spin and the host carriers. For a pair of Mn impurities, we find signaturesof the indirect (carrier-mediated) exchange interaction in the time evolution of the impurity spins.Finally, we examine temporal correlations between the two Mn spins and their dependence on theexchange coupling and spin-orbit interaction strength, as well as on the initial spin-configuration andseparation between the impurities. Our results provide insight into the dynamic interaction betweenlocalized magnetic impurities in a nano-scaled magnetic-semiconductor sample, in the extremelydilute(solotronics) regime.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Condensed Matter Physics
- Kondenserade materians fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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