1. Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, Microsystems for Space Technologies Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-2002 Neuchâtel, Switzerland, Department of Physics, University of California, Santa Barbara, California 93106, Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech Building 345 East, DK-2800 Kongens Lyngby, Denmark, and Materials Department, University of California, Santa...