1. Laboratory of Nanoscale Biology, Institute of Bioengineering, School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
2. Department of Applied Physics, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden
3. Department of Mechanical Science and Engineering, University of Illinois at Urbana−Champaign, Urbana, 61801 Illinois United States
4. Max Planck-EPFL Laboratory for Molecular Nanoscience and Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
5. Electrical Engineering Institute, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
6. Institute of Materials Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland