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Magnetotransport on the nano scale

Willke, Philip; Kotzott, Thomas; Pruschke, Thomas; Wenderoth, Martin

Abstract:
Transport experiments in strong magnetic fields show a variety of fascinating phenomena like the quantum Hall effect, weak localization or the giant magnetoresistance. Often they originate from the atomic-scale structure inaccessible to macroscopic magnetotransport experiments. To connect spatial information with transport properties, various advanced scanning probe methods have been developed. Capable of ultimate spatial resolution, scanning tunnelling potentiometry has been used to determine the resistance of atomic-scale defects such as steps and interfaces. Here we combine this technique with magnetic fields and thus transfer magnetotransport experiments to the atomic scale. Monitoring the local voltage drop in epitaxial graphene, we show how the magnetic field controls the electric field components. We find that scattering processes at localized defects are independent of the strong magnetic field while monolayer and bilayer graphene sheets show a locally varying conductivity and charge carrier concentration differing from the macroscopic average.

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Verlagsausgabe §
DOI: 10.5445/IR/1000119951
Veröffentlicht am 04.06.2020
Originalveröffentlichung
DOI: 10.1038/ncomms15283
Scopus
Zitationen: 8
Web of Science
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2017
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000119951
Erschienen in Nature Communications
Band 8
Heft 1
Seiten Art.-Nr.: 15283
Vorab online veröffentlicht am 04.05.2017
Nachgewiesen in Scopus
Web of Science
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