Breakdown of Zero-Energy Quantum Hall State in Graphene in the Light of Current Fluctuations and Shot Noise

We have investigated the cross-over from Zener tunneling of single charge carriers to avalanche type of bunched electron transport in a suspended graphene Corbino disk in the zeroth Landau level. At low bias, we find a tunneling current that follows the gyrotropic Zener tunneling behavior. At larger bias, we find an avalanche type of transport that sets in at a smaller current the larger the magnetic field is. The low-frequency noise indicates strong bunching of the electrons in the avalanches. On the basis of the measured low-frequency switching noise power, we deduce the characteristic switching rates of the avalanche sequence. The simultaneous microwave shot noise measurement also reveals intrinsic correlations within the avalanche pulses and indicate a decrease in correlations with increasing bias.

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| openaire: EC/H2020/670743/EU//QuDeT

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Dielectric breakdown, Graphene, Quantum Hall, Shot noise

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10.1007/s10909-018-1855-x

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Laitinen, A, Kumar, M, Elo, T, Liu, Y, Abhilash, T S & Hakonen, P J 2018, 'Breakdown of Zero-Energy Quantum Hall State in Graphene in the Light of Current Fluctuations and Shot Noise', Journal of Low Temperature Physics, vol. 191, no. 5-6, pp. 272–287. https://doi.org/10.1007/s10909-018-1855-x

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https://urn.fi/URN:NBN:fi:aalto-201808014284

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[article-cris] Perustieteiden korkeakoulu / SCI

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Breakdown of Zero-Energy Quantum Hall State in Graphene in the Light of Current Fluctuations and Shot Noise

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