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  • Title: Warping a single Mn acceptor wavefunction by straining the GaAs host.
    Author: Yakunin AM, Silov AY, Koenraad PM, Tang JM, Flatté ME, Primus JL, Van Roy W, De Boeck J, Monakhov AM, Romanov KS, Panaiotti IE, Averkiev NS.
    Journal: Nat Mater; 2007 Jul; 6(7):512-5. PubMed ID: 17558428.
    Abstract:
    Transition-metal dopants such as Mn determine the ferromagnetism in dilute magnetic semiconductors such as Ga(1-x)Mn(x)As. Recently, the acceptor states of Mn dopants in GaAs were found to be highly anisotropic owing to the symmetry of the host crystal. Here, we show how the shape of such a state can be modified by local strain. The Mn acceptors near InAs quantum dots are mapped at room temperature by scanning tunnelling microscopy. Dramatic distortions and a reduction in the symmetry of the wavefunction of the hole bound to the Mn acceptor are observed originating from strain induced by quantum dots. Calculations of the acceptor-state wavefunction in the presence of strain, within a tight-binding model and within an effective-mass model, agree with the experimentally observed shape. The magnetic easy axes of strained lightly doped Ga(1-x)Mn(x)As can be explained on the basis of the observed local density of states for the single Mn spin.
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