D. Heiss (1), S. Schaeck (1), H. Huebl (1), M. Bichler (1), G.
  Abstreiter (1), J. J. Finley (1) D. V. Bulaev (2), Daniel Loss (2) ((1)
  Walter Schottky Institut, Technische Universit\"at M\"unchen, (2) Department
  of Physics and Astronomy, University of Basel)