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Journal Article

Phonon-Mediated Electron Transport through CaO Thin Films

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons32659

Cui,  Yi
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84699

Schneider,  Wolf-Dieter
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Ecole Polytechnique Fédérale de Lausanne, Institute of Physics;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21916

Nilius,  Niklas
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Carl von Ossietzky Universität Oldenburg, Institut für Physik;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

PhysRevLett.114.016804.pdf
(Publisher version), 377KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Cui, Y., Tosoni, S., Schneider, W.-D., Pacchioni, G., Nilius, N., & Freund, H.-J. (2015). Phonon-Mediated Electron Transport through CaO Thin Films. Physical Review Letters, 114(1): 016804. doi:10.1103/PhysRevLett.114.016804.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-A862-2
Abstract
Scanning tunneling microscopy has developed into a powerful tool for the characterization of conductive surfaces, for which the overlap of tip and sample wave functions determines the image contrast. On insulating layers, as the CaO thin film grown on Mo(001) investigated here, direct overlap between initial and final states is not enabled anymore and electrons are transported via hopping through the conduction-band states of the oxide. Carrier transport is accompanied by strong phonon excitations in this case, imprinting an oscillatory signature on the differential conductance spectra of the system. The phonons show a characteristic spatial dependence and become softer around lattice irregularities in the oxide film, such as dislocation lines.