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Kalmbach, C.-C. [VerfasserIn]; Ahlers, Franz-J. [VerfasserIn]; Schurr, J. [VerfasserIn]; Müller, A. [VerfasserIn]; Feilhauer, J. [VerfasserIn]; Kruskopf, M. [VerfasserIn]; Pierz, Klaus [VerfasserIn]; Hohls, Frank [VerfasserIn]; Haug, Rolf J. [VerfasserIn]

Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene - [published Version]

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  • Medientyp: E-Artikel; Sonstige Veröffentlichung
  • Titel: Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene
  • Beteiligte: Kalmbach, C.-C. [VerfasserIn]; Ahlers, Franz-J. [VerfasserIn]; Schurr, J. [VerfasserIn]; Müller, A. [VerfasserIn]; Feilhauer, J. [VerfasserIn]; Kruskopf, M. [VerfasserIn]; Pierz, Klaus [VerfasserIn]; Hohls, Frank [VerfasserIn]; Haug, Rolf J. [VerfasserIn]
  • Erschienen: College Park, MD : American Physical Society, 2016
  • Erschienen in: Physical Review B 94 (2016), Nr. 20
  • Ausgabe: published Version
  • Sprache: Englisch
  • DOI: https://doi.org/10.15488/2875; https://doi.org/10.1103/PhysRevB.94.205430
  • Schlagwörter: Quantum interference effects ; Quantum metrology ; Fluctuations & noise ; Conductivity ; Landau levels ; Integer quantum Hall effect ; Mesoscopics
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  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: 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.
  • Zugangsstatus: Freier Zugang