Affiliation: | 1.Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA;2.Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA;3.Center for Nanophysics, and Advanced Materials, and Department of Physics, University of Maryland, College Park, MD 20742-4111, USA |