Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-21
Phys Rev B 81, 045417 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 figures, Phys Rev B 81, 045417 (2010)
Scientific paper
10.1103/PhysRevB.81.045417
In the atomic force microscope, the nanoscale force topography of even complex surface superstructures is extracted by the changing vibration frequency of a scanning tip. An alternative dissipation topography with similar or even better contrast has been demonstrated recently by mapping the (x,y)-dependent tip damping but the detailed damping mechanism is still unknown. Here we identify two different tip dissipation mechanisms: local mechanical softness and hysteresis. Motivated by recent data, we describe both of them in a onedimensional model of Moire' superstructures of incommensurate overlayers. Local softness at "soliton" defects yields a dissipation contrast that can be much larger than the corresponding density or corrugation contrast. At realistically low vibration frequencies, however, a much stronger and more effective dissipation is caused by the tip-induced nonlinear jumping of the soliton, naturally developing bistability and hysteresis. Signatures of this mechanism are proposed for experimental identification.
Manini Nicola
Negri Carlotta
Santoro Giuseppe E.
Tosatti Erio
Vanossi Andrea
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