title: Warping a single Mn acceptor wavefunction by straining the GaAs host.
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.
authors.affiliation: COBRA Inter-University Research Institute, Eindhoven University of Technology, PO Box 513, NL-5600MB Eindhoven, The Netherlands. a.m.yakunin@tue.nl
authors.forename: A M
authors.initials: AM
authors.lastname: Yakunin
authors.forename: A Yu
authors.initials: AY
authors.lastname: Silov
authors.forename: P M
authors.initials: PM
authors.lastname: Koenraad
authors.forename: J-M
authors.initials: JM
authors.lastname: Tang
authors.forename: M E
authors.initials: ME
authors.lastname: Flatté
authors.forename: J-L
authors.initials: JL
authors.lastname: Primus
authors.forename: W
authors.initials: W
authors.lastname: Van Roy
authors.forename: J
authors.initials: J
authors.lastname: De Boeck
authors.forename: A M
authors.initials: AM
authors.lastname: Monakhov
authors.forename: K S
authors.initials: KS
authors.lastname: Romanov
authors.forename: I E
authors.initials: IE
authors.lastname: Panaiotti
authors.forename: N S
authors.initials: NS
authors.lastname: Averkiev