Single electron Transport in diluted magnetic semiconductor quantum dots

We consider a single electron transistor based upon a II-VI semiconductor quantum dot doped with a few Mn atoms.Our proposal is motivated by the recent fabrication and optical probing of single CdTe quantum dots doped with a single Mn [1]. The numerical diagonalization of the quantum dot Hamiltonian is possible in the case of small number of both carriers and Mn [2],[3],[4]. Our calculations [5] reveal that the magnetic ions behave like a quantum nanomagnet whose the total spin and magnetic anisotropy depend dramatically both on the number of carriers and their orbital nature. We show that single electron transport spectroscopy permits a complete characterization of electronic excitations of the dot. A protocol of gate voltage pulses that permits the preparation and detection of the quantum state of a single Mn spin is presented. \newline \newline (1) L. Besombes, et al. Phys. Rev. Lett. {\bf 93}, 207403 (2004) \newline (2) J. Fern\'{a}ndez-Rossier, . PRB, Jan 2006 \newline (3) A. O. Govorov, Phys. Rev. B{\bf 72 }, 075359(2005). \newline (4) F. Qu, P. Hawrylak, Phys. Rev. Lett. {\bf 95}, 217206 (2005) \newline (5) J. Fern\'{a}ndez-Rossier, R. Aguado, in prep.