Kotzott, Thomas

[["dc.bibliographiccitation.artnumber","15283"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.lastpage","7"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Willke, Philip"],["dc.contributor.author","Kotzott, Thomas"],["dc.contributor.author","Pruschke, Thomas"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2018-11-07T10:23:54Z"],["dc.date.available","2018-11-07T10:23:54Z"],["dc.date.issued","2017"],["dc.description.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."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1038/ncomms15283"],["dc.identifier.isi","000400561800001"],["dc.identifier.pmid","28469282"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14628"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42553"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","2041-1723"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.title","Magnetotransport on the nano scale"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","113044"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Kotzott, Thomas"],["dc.contributor.author","Bouhassoune, Mohammed"],["dc.contributor.author","Prüser, Henning"],["dc.contributor.author","Weismann, Alexander"],["dc.contributor.author","Lounis, Samir"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2022-01-11T14:05:53Z"],["dc.date.available","2022-01-11T14:05:53Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract We investigate single Ge and Ag impurities buried below a Cu(100) surface using low temperature scanning tunneling microscopy. The interference patterns in the local density of states are surface scattering signatures of the bulk impurities, which result from 3D Friedel oscillations and the electron focusing effect. Comparing the isoelectronic d scatterer Ag and the sp scatterer Ge allows to distinguish contributions from impurity scattering and the host. Energy-independent effective scattering phase shifts are extracted using a plane wave tight-binding model and reveal similar values for both species. A comparison with ab initio calculations suggests incoherent sp scattering processes at the Ge impurity. As both scatterers are spectrally homogeneous, scanning tunneling spectroscopy of the interference patterns yields real-space signatures of the bulk electronic structure. We find a kink around zero bias for both species that we assign to a renormalization of the band structure due to many-body effects, which can be described with a Debye self-energy and a surprisingly high electron–phonon coupling parameter λ . We propose that this might originate from bulk propagation in the vicinity of the surface."],["dc.description.abstract","Abstract We investigate single Ge and Ag impurities buried below a Cu(100) surface using low temperature scanning tunneling microscopy. The interference patterns in the local density of states are surface scattering signatures of the bulk impurities, which result from 3D Friedel oscillations and the electron focusing effect. Comparing the isoelectronic d scatterer Ag and the sp scatterer Ge allows to distinguish contributions from impurity scattering and the host. Energy-independent effective scattering phase shifts are extracted using a plane wave tight-binding model and reveal similar values for both species. A comparison with ab initio calculations suggests incoherent sp scattering processes at the Ge impurity. As both scatterers are spectrally homogeneous, scanning tunneling spectroscopy of the interference patterns yields real-space signatures of the bulk electronic structure. We find a kink around zero bias for both species that we assign to a renormalization of the band structure due to many-body effects, which can be described with a Debye self-energy and a surprisingly high electron–phonon coupling parameter λ . We propose that this might originate from bulk propagation in the vicinity of the surface."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1088/1367-2630/ac3681"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/97768"],["dc.notes.intern","DOI-Import GROB-507"],["dc.relation.eissn","1367-2630"],["dc.relation.orgunit","IV. Physikalisches Institut"],["dc.rights","CC BY 4.0"],["dc.title","Scanning tunneling spectroscopy of subsurface Ag and Ge impurities in copper"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]