Local spectroscopy and atomic imaging of tunneling current, forces and dissipation on graphite

Details Local spectroscopy and atomic imaging of tunneling current, forces and dissipation on graphite Local spectroscopy and atomic imaging of tunneling current, forces and dissipation on graphite

2005-01-04

arxiv.org/abs/cond-mat/0501045v1

Phys. Rev. Lett. 94, 056101 (2005)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, accepted at Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.056101

Theory predicts that the currents in scanning tunneling microscopy (STM) and the attractive forces measured in atomic force microscopy (AFM) are directly related. Atomic images obtained in an attractive AFM mode should therefore be redundant because they should be \emph{similar} to STM. Here, we show that while the distance dependence of current and force is similar for graphite, constant-height AFM- and STM images differ substantially depending on distance and bias voltage. We perform spectroscopy of the tunneling current, the frequency shift and the damping signal at high-symmetry lattice sites of the graphite (0001) surface. The dissipation signal is about twice as sensitive to distance as the frequency shift, explained by the Prandtl-Tomlinson model of atomic friction.

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