Effective Hamiltonian for Ga1-x MnxAs in the dilute limit.
We derive an effective Hamiltonian for Ga(1-x)Mn(x)As in the dilute limit, where Ga(1-x)Mn(x)As can be described in terms of spin F=3/2 polarons hopping between the Mn sites and coupled to the local Mn spins. We determine the parameters of our model from microscopic calculations. Our approach treats the large Coulomb interaction in a nonperturbative way, captures the effects of spin-orbit coupling and disorder, and is appropriate for other p-doped magnetic semiconductors.
Fiete
Gregory A
GA
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Zaránd
Gergely
G
Damle
Kedar
K