Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene
| Autor: | A. Müller, J. Feilhauer, C.-C. Kalmbach, Rolf J. Haug, Klaus Pierz, Jürgen Schurr, Frank Hohls, F. J. Ahlers, Mattias Kruskopf |
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| Rok vydání: | 2016 |
| Předmět: |
Noise power
FOS: Physical sciences 02 engineering and technology Quantum metrology Quantum Hall effect Mesoscopics 01 natural sciences Noise (electronics) 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Fluctuations & noise ddc:530 Exponential decay 010306 general physics Integer quantum Hall effect Quantum interference effects Landau levels Physics Mesoscopic physics Conductivity Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Conductance Spectral density 021001 nanoscience & nanotechnology Magnetic field Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik 0210 nano-technology |
| Zdroj: | Physical Review B 94 (2016), Nr. 20 |
| DOI: | 10.48550/arxiv.1609.04950 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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