1. Department of Physics, Applied Physics and Astronomy, and Center
for Materials, Devices, and Integrated Systems, ‡Department of Materials Science and
Engineering, and Center for Materials, Devices, and Integrated Systems, and §Department of Chemistry
and Chemical Biology, and Center for Materials, Devices, and Integrated
Systems, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180-3950, United States