Institution: | (1) Physik-Department E15, Technische Universität München, D-85747 Garching, Germany;(2) Department of Physics, State University of New York at Albany, 12222 Albany, NY, USA;(3) Center for Materials Research, Stanford University, 94305-4045 Stanford, CA, USA;(4) Materials Science Center, Cornell University, 14853 Ithaca, NY, USA |