Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 84: Nanotribology
O 84.1: Vortrag
Donnerstag, 3. April 2014, 16:00–16:15, WIL B321
Theory of charge-density-wave noncontact phase slip nanofriction — •Franco Pellegrini1,2, Giuseppe E. Santoro1,2,3, and Erio Tosatti1,2,3 — 1SISSA, Via Bonomea 265, I-34136 Trieste, Italy — 2CNR-IOM Democritos National Simulation Center, Via Bonomea 265, I-34136 Trieste, Italy — 3nternational Centre for Theoretical Physics (ICTP), P.O. Box 586, I-34014 Trieste, Italy
Bulk dissipation caused by charge-density-wave (CDW) voltage-induced depinning and sliding is a classic subject. We present a local, nanoscale mechanism describing the occurrence of distance-dependent dissipation in the dynamics of an atomic force microscope tip oscillating over the surface of a CDW material. A mechanical tip hysteresis is predicted in correspondence to localized 2π slips of the CDW phase, giving rise to large tip dissipation peaks at selected distances. Results of static and dynamic numerical simulations of the tip-surface interaction are believed to be relevant to recent experiments on the layered compound NbSe2.