1. Department of Electrical, Computer and Systems Engineering, The Center for Materials, Devices, and Integrated Systems, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
2. Department of Physics, Applied Physics and Astronomy, The Center for Materials, Devices, and Integrated Systems, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
3. Department of Materials Science and Engineering, The Center for Materials, Devices, and Integrated Systems, Rensselaer Polytechnic Institute, Troy, New York 12180, USA