A method to measure the thermovoltage with a high spatial resolution

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Abstract

We have recorded spatial maps of the thermovoltage of a Au(111) surface with a scanning tunneling microscope. The method relies on an approach where we record quasi-simultaneously the normal topography as well as the thermovoltage by switching the feedback and sample bias on and off. This setup can be combined with standard scanning tunneling microscopy and scanning tunnelingspectroscopy techniques. The thermovoltage, which arises from a temperature difference between scanning tunneling microscope tip and sample, is very sensitive to small variations of the local electronic density of states in vicinity of the Fermi level. Near step edges we have observed well-defined Friedel oscillations, while for the herringbone reconstruction, small variations of the local work-function are measured. By altering the tip-sample distance, the thermovoltage contrast can be adjusted.
Original languageEnglish
Article number141601
Pages (from-to)-
Number of pages4
JournalApplied physics letters
Volume108
Issue number14
DOIs
Publication statusPublished - 2016

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spatial resolution
scanning
high resolution
microscopes
scanning tunneling microscopy
temperature gradients
topography
oscillations
electronics

Keywords

  • METIS-317146
  • IR-100726

Cite this

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abstract = "We have recorded spatial maps of the thermovoltage of a Au(111) surface with a scanning tunneling microscope. The method relies on an approach where we record quasi-simultaneously the normal topography as well as the thermovoltage by switching the feedback and sample bias on and off. This setup can be combined with standard scanning tunneling microscopy and scanning tunnelingspectroscopy techniques. The thermovoltage, which arises from a temperature difference between scanning tunneling microscope tip and sample, is very sensitive to small variations of the local electronic density of states in vicinity of the Fermi level. Near step edges we have observed well-defined Friedel oscillations, while for the herringbone reconstruction, small variations of the local work-function are measured. By altering the tip-sample distance, the thermovoltage contrast can be adjusted.",
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A method to measure the thermovoltage with a high spatial resolution. / Sotthewes, Kai; Siekman, Martin Herman; Zandvliet, Henricus J.W.

In: Applied physics letters, Vol. 108, No. 14, 141601, 2016, p. -.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A method to measure the thermovoltage with a high spatial resolution

AU - Sotthewes, Kai

AU - Siekman, Martin Herman

AU - Zandvliet, Henricus J.W.

PY - 2016

Y1 - 2016

N2 - We have recorded spatial maps of the thermovoltage of a Au(111) surface with a scanning tunneling microscope. The method relies on an approach where we record quasi-simultaneously the normal topography as well as the thermovoltage by switching the feedback and sample bias on and off. This setup can be combined with standard scanning tunneling microscopy and scanning tunnelingspectroscopy techniques. The thermovoltage, which arises from a temperature difference between scanning tunneling microscope tip and sample, is very sensitive to small variations of the local electronic density of states in vicinity of the Fermi level. Near step edges we have observed well-defined Friedel oscillations, while for the herringbone reconstruction, small variations of the local work-function are measured. By altering the tip-sample distance, the thermovoltage contrast can be adjusted.

AB - We have recorded spatial maps of the thermovoltage of a Au(111) surface with a scanning tunneling microscope. The method relies on an approach where we record quasi-simultaneously the normal topography as well as the thermovoltage by switching the feedback and sample bias on and off. This setup can be combined with standard scanning tunneling microscopy and scanning tunnelingspectroscopy techniques. The thermovoltage, which arises from a temperature difference between scanning tunneling microscope tip and sample, is very sensitive to small variations of the local electronic density of states in vicinity of the Fermi level. Near step edges we have observed well-defined Friedel oscillations, while for the herringbone reconstruction, small variations of the local work-function are measured. By altering the tip-sample distance, the thermovoltage contrast can be adjusted.

KW - METIS-317146

KW - IR-100726

U2 - 10.1063/1.4945665

DO - 10.1063/1.4945665

M3 - Article

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JO - Applied physics letters

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