Wenderoth, Martin

[["dc.bibliographiccitation.artnumber","10108"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Kloth, Philipp"],["dc.contributor.author","Kaiser, Katharina"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2018-11-07T10:21:13Z"],["dc.date.available","2018-11-07T10:21:13Z"],["dc.date.issued","2016"],["dc.description.abstract","The miniaturization of future electronic devices is intimately connected to the ability to control electric fields on the atomic scale. In a nanoscopic system defined by a limited number of charges, the combined dynamics of bound and free charges become important. Here we present a model system based on the electrostatic interaction between a metallic tip of a scanning tunnelling microscope and a GaAs(110) semiconductor surface. The system is driven out of equilibrium by optical excitation, which provides ambipolar free charge carriers, and by an optically induced unipolar tunnel current. This combination enables the active control of the density and spatial distribution of free and bound charge in the space-charge region, that is, modifying the screening processes. Temporal fluctuations of single dopants are modified, meaning we are able to control the noise of the system. It is found that free charge carriers suppress the noise level in field-controlled, nanoscopic systems."],["dc.description.sponsorship","[CRC1073]; [C4]"],["dc.identifier.doi","10.1038/ncomms10108"],["dc.identifier.isi","000369018600001"],["dc.identifier.pmid","26728867"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12893"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42049"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation.issn","2041-1723"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.title","Controlling the screening process of a nanoscaled space charge region by minority carriers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","033047"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Schröder, Benjamin"],["dc.contributor.author","Bunjes, Ole"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Kaiser, Katharina"],["dc.contributor.author","Traeger, Georg A"],["dc.contributor.author","Kotzott, Thomas"],["dc.contributor.author","Ropers, Claus"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2020-05-13T10:58:36Z"],["dc.date.available","2020-05-13T10:58:36Z"],["dc.date.issued","2020"],["dc.description.abstract","We investigate photocurrents driven by femtosecond laser excitation of a (sub)-nanometer tunnel junction in an ultrahigh vacuum low-temperature scanning tunneling microscope (STM). The optically driven charge transfer is revealed by tip retraction curves showing a current contribution for exceptionally large tip-sample distances, evidencing a strongly reduced effective barrier height for photoexcited electrons at higher energies. Our measurements demonstrate that the magnitude of the photo-induced electron transport can be controlled by the laser power as well as the applied bias voltage. In contrast, the decay constant of the photocurrent is only weakly affected by these parameters. Stable STM operation with photoelectrons is demonstrated by acquiring constant current topographies. An effective non-equilibrium electron distribution as a consequence of multiphoton absorption is deduced by the analysis of the photocurrent using a one-dimensional potential barrier model."],["dc.identifier.doi","10.1088/1367-2630/ab74ac"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65298"],["dc.language.iso","en"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation.issn","1367-2630"],["dc.rights","CC BY 4.0"],["dc.title","Controlling photocurrent channels in scanning tunneling microscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]