Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 11: Methods: Scanning probe techniques II

O 11.4: Talk

Monday, March 22, 2010, 15:45–16:00, H32

Local density of states from constant-current tunneling spectra — Martin Ziegler, Nicolas Néel, •Alexander Sperl, Jörg Kröger, and Richard Berndt — Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

Scanning tunnelling spectroscopy of the differential conductance is often performed at constant tip-surface distance. Sometimes it is advantageous to acquire spectra at constant current. However, the latter method may significantly affect peak positions and line shapes in spectra as well as patterns in spatial maps of the differential conductance. A normalization procedure for constant-current data, which relies on experimental current-distance data, is shown to yield spectral information on the local density of states. Financial support by the Deutsche Forschungsgemeinschaft through SFB 668 and SFB 677 is acknowledged.