1. Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-235A&B, Cambridge, Massachusetts 02139, United States
2. Department of Mechanical Engineering, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
3. Laboratory of Bio-Inspired Nanomechanics “Giuseppe Maria Pugno”, Department of Structural Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy