Assessment of scanning tunneling spectroscopy modes inspecting electron confinement in surface-confined supramolecular networks

Wolfgang Krenner; Dirk Kühne; Florian Klappenberger; Johannes V. Barth

doi:10.1038/srep01454

Assessment of scanning tunneling spectroscopy modes inspecting electron confinement in surface-confined supramolecular networks

Wolfgang Krenner, Dirk Kühne, Florian Klappenberger, Johannes V. Barth

Chair of Experimental Physics of Functional Spin-Systems

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

Scanning tunneling spectroscopy (STS) enables the local, energy-resolved investigation of a samples surface density of states (DOS) by measuring the differential conductance (dI/dV) being approximately proportional to the DOS. It is popular to examine the electronic structure of elementary samples by acquiring dI/dV maps under constant current conditions. Here we demonstrate the intricacy of STS mapping of samples exhibiting a strong corrugation originating from electronic density and local work function changes. The confinement of the Ag(111) surface state by a porous organic network is studied with maps obtained under constant-current (CC) as well as open-feedback-loop (OFL) conditions. We show how the CC maps deviate markedly from the physically more meaningful OFL maps. By applying a renormalization procedure to the OFL data we can mimic the spurious effects of the CC mode and thereby rationalize the physical effects evoking the artefacts in the CC maps.

Original language	English
Article number	1454
Journal	Scientific Reports
Volume	3
DOIs	https://doi.org/10.1038/srep01454
State	Published - 2013

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10.1038/srep01454

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title = "Assessment of scanning tunneling spectroscopy modes inspecting electron confinement in surface-confined supramolecular networks",

abstract = "Scanning tunneling spectroscopy (STS) enables the local, energy-resolved investigation of a samples surface density of states (DOS) by measuring the differential conductance (dI/dV) being approximately proportional to the DOS. It is popular to examine the electronic structure of elementary samples by acquiring dI/dV maps under constant current conditions. Here we demonstrate the intricacy of STS mapping of samples exhibiting a strong corrugation originating from electronic density and local work function changes. The confinement of the Ag(111) surface state by a porous organic network is studied with maps obtained under constant-current (CC) as well as open-feedback-loop (OFL) conditions. We show how the CC maps deviate markedly from the physically more meaningful OFL maps. By applying a renormalization procedure to the OFL data we can mimic the spurious effects of the CC mode and thereby rationalize the physical effects evoking the artefacts in the CC maps.",

author = "Wolfgang Krenner and Dirk K{\"u}hne and Florian Klappenberger and Barth, {Johannes V.}",

note = "Funding Information: The authors would like to thank C.A. Palma for proofreading the manuscript and helpful discussions. Funding by the German Research Foundation (DFG) (via BA 3395/2-1, the TUM International Graduate School of Science and Engineering (IGSSE) and the TUM Institute of Advanced Study (IAS)) and the European Union (via ERC Advanced Grant MolArt (u247299)) is gratefully acknowledged.",

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doi = "10.1038/srep01454",

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volume = "3",

journal = "Scientific Reports",

publisher = "Nature Publishing Group",

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AU - Krenner, Wolfgang

AU - Kühne, Dirk

AU - Klappenberger, Florian

AU - Barth, Johannes V.

N1 - Funding Information: The authors would like to thank C.A. Palma for proofreading the manuscript and helpful discussions. Funding by the German Research Foundation (DFG) (via BA 3395/2-1, the TUM International Graduate School of Science and Engineering (IGSSE) and the TUM Institute of Advanced Study (IAS)) and the European Union (via ERC Advanced Grant MolArt (u247299)) is gratefully acknowledged.

PY - 2013

Y1 - 2013

N2 - Scanning tunneling spectroscopy (STS) enables the local, energy-resolved investigation of a samples surface density of states (DOS) by measuring the differential conductance (dI/dV) being approximately proportional to the DOS. It is popular to examine the electronic structure of elementary samples by acquiring dI/dV maps under constant current conditions. Here we demonstrate the intricacy of STS mapping of samples exhibiting a strong corrugation originating from electronic density and local work function changes. The confinement of the Ag(111) surface state by a porous organic network is studied with maps obtained under constant-current (CC) as well as open-feedback-loop (OFL) conditions. We show how the CC maps deviate markedly from the physically more meaningful OFL maps. By applying a renormalization procedure to the OFL data we can mimic the spurious effects of the CC mode and thereby rationalize the physical effects evoking the artefacts in the CC maps.

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Assessment of scanning tunneling spectroscopy modes inspecting electron confinement in surface-confined supramolecular networks

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