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

Antti Laitinen, Manohar Kumar, Teemu Elo, Ying Liu, T. S. Abhilash, Pertti J. Hakonen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)272-287
Number of pages16
JournalJournal of Low Temperature Physics
Volume191
Issue number5-6
DOIs
Publication statusPublished - 1 Jun 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Dielectric breakdown
  • Graphene
  • Quantum Hall
  • Shot noise

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