Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene

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dc.identifier.uri http://dx.doi.org/10.15488/2875
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2901
dc.contributor.author Kalmbach, C.-C.
dc.contributor.author Ahlers, Franz-J.
dc.contributor.author Schurr, J.
dc.contributor.author Müller, A.
dc.contributor.author Feilhauer, J.
dc.contributor.author Kruskopf, M.
dc.contributor.author Pierz, Klaus
dc.contributor.author Hohls, Frank
dc.contributor.author Haug, Rolf J.
dc.date.accessioned 2018-02-23T13:51:48Z
dc.date.available 2018-02-23T13:51:48Z
dc.date.issued 2016
dc.identifier.citation Kalmbach, C.-C.; Ahlers, F.J.; Schurr, J.; Müller, A.; Feilhauer, J. et al.: Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene. In: Physical Review B 94 (2016), Nr. 20, 205430. DOI: https://doi.org/10.1103/PhysRevB.94.205430
dc.description.abstract We investigate the 1/f noise properties of epitaxial graphene devices at low temperatures as a function of temperature, current, and magnetic flux density. At low currents, an exponential decay of the 1/f noise power spectral density with increasing temperature is observed that indicates mesoscopic conductance fluctuations as the origin of 1/f noise at temperatures below 50 K. At higher currents, deviations from the typical quadratic current dependence and the exponential temperature dependence occur as a result of nonequilibrium conditions due to current heating. By applying the Kubakaddi theory [S. S. Kubakaddi, Phys. Rev. B 79, 075417 (2009)10.1103/PhysRevB.79.075417], a model describing the 1/f noise power spectral density of nonequilibrium mesoscopic conductance fluctuations in epitaxial graphene is developed and used to determine the energy loss rate per carrier. In the regime of Shubnikov-de Haas oscillations, a strong increase of 1/f noise is observed, which we attribute to an additional conductance fluctuation mechanism due to localized states in quantizing magnetic fields. When the device enters the regime of quantized Hall resistance, the 1/f noise vanishes. It reappears if the current is increased and quantum Hall breakdown sets in. © 2016 American Physical Society. eng
dc.language.iso eng
dc.publisher College Park, MD : American Physical Society
dc.relation.ispartofseries Physical Review B 94 (2016), Nr. 20
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject Conductivity eng
dc.subject Fluctuations & noise eng
dc.subject Integer quantum Hall effect eng
dc.subject Landau levels eng
dc.subject Mesoscopics eng
dc.subject Quantum interference effects eng
dc.subject Quantum metrology eng
dc.subject.ddc 530 | Physik ger
dc.title Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene
dc.type article
dc.type Text
dc.relation.issn 24699950
dc.relation.doi https://doi.org/10.1103/PhysRevB.94.205430
dc.bibliographicCitation.issue 20
dc.bibliographicCitation.volume 94
dc.bibliographicCitation.firstPage 205430
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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