Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.43: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Magnetic Quantum Dots — •Peter Moraczewski and Daniela Pfannkuche — 1. Intitut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg

In semiconductor quantum dots electrons and holes are confined in all three spatial directions. Their eigenstates can be tailored by the used materials, the size and the shape of the dot and also by applied electric and magnetic fields. When we insert atoms with a large magnetic moment, like Mn, into the quantum dot they interact with the electrons or holes via electric and magnetic interactions. We can now expect to manipulate the alignment of the Mn-spins by changing the states of electrons or holes. In III-V semiconductors such as GaAs the Mn atom is an acceptor, so holes will be the main charge carriers. We calculate the eigenstates of several holes in a quantum dot by k*p-theory-, under the influence of a magnetic field and with many-body interaction. Then we examine the interplay between the hole states and the magnetic impurities and calculate the resulting magnetization of the dot.