Scientific Reports (Sep 2021)

Localization to delocalization probed by magnetotransport of hBN/graphene/hBN stacks in the ultra-clean regime

  • Takuya Iwasaki,
  • Satoshi Moriyama,
  • Nurul Fariha Ahmad,
  • Katsuyoshi Komatsu,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Yutaka Wakayama,
  • Abdul Manaf Hashim,
  • Yoshifumi Morita,
  • Shu Nakaharai

DOI
https://doi.org/10.1038/s41598-021-98266-4
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 6

Abstract

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Abstract We report on magnetotransport in a high-quality graphene device, which is based on monolayer graphene (Gr) encapsulated by hexagonal boron nitride (hBN) layers, i.e., hBN/Gr/hBN stacks. In the vicinity of the Dirac point, a negative magnetoconductance is observed for high temperatures > ~ 40 K, whereas it becomes positive for low temperatures ≤ ~ 40 K, which implies an interplay of quantum interferences in Dirac materials. The elastic scattering mechanism in hBN/Gr/hBN stacks contrasts with that of conventional graphene on SiO2, and our ultra-clean graphene device shows nonzero magnetoconductance for high temperatures of up to 300 K.