Scanning Seebeck tunneling microscopy

The tunneling Seebeck effect in a metal-vacuum-metal junction is studied experimentally in a scanning tunneling microscopy setup. Selective heating of the tip with a laser generates a well-defined temperature difference at the tunnel junction. The thermovoltage between the tip and the sample is meas...

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Bibliographic Details
Published inJournal of physics. D, Applied physics Vol. 51; no. 32; pp. 324001 - 324005
Main Authors Friesen, Cody, Osterhage, Hermann, Friedlein, Johannes, Schlenhoff, Anika, Wiesendanger, Roland, Krause, Stefan
Format Journal Article
LanguageEnglish
Published IOP Publishing 15.08.2018
Subjects
atomic scale
current rectification
scanning tunneling microscopy
scanning tunneling spectroscopy
Seebeck tunneling
surface science
thermopower
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Summary:The tunneling Seebeck effect in a metal-vacuum-metal junction is studied experimentally in a scanning tunneling microscopy setup. Selective heating of the tip with a laser generates a well-defined temperature difference at the tunnel junction. The thermovoltage between the tip and the sample is measured with atomic-scale lateral resolution and related to the band structure of the junction, as revealed by local tunneling spectroscopy. Tunnel current rectification experiments in compensated conditions allow for a direct measurement of the Seebeck coefficient without the need for tip heating, thereby realizing Seebeck mapping on the atomic scale.
Bibliography:JPhysD-116776.R2
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aacfab