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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • National University of Defense Technology
  • Ecole Normale Supérieure

Abstract

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.

Details

Original languageEnglish
Pages (from-to)272–287
Number of pages16
JournalJournal of Low Temperature Physics
Volume191
Issue number5-6
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Dielectric breakdown, Graphene, Quantum Hall, Shot noise

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