1Davide Mandelli and Erio Tosatti are at the International School for Advanced Studies (SISSA), 34136 Trieste, Italy.
2E.T. is also at the Abdus Salam International Centre for Theoretical Physics, Trieste, and the Democritos National Laboratory, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, Trieste.
Email:[email protected]
Cold ions sliding across periodic energy-potential patterns formed by lasers have been used to elucidate the physics of dry friction between crystals. Experiments with no more than six ions suffice to explore a vast domain of frictional forces.
Email:[email protected]
Published online 14 October 2015
