Acknowledgment: This work made use of the University of Utah USTAR shared facilities support, in part, by the MRSEC Program of NSF under Award No. DMR-1121252. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525). We thank M. Wang and Prof. J. Gerton for their support on the PL measurements, and Dr. J. Lee and D. Stowe for valuable discussions.
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