Article Transport Anisotropy in One-Dimensional Graphene Superlattice in the High Kronig-Penney Potential Limit

Tianlin Li ; Hanying Chen ; Kun Wang ; Yifei Hao ; Le Zhang ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Xia Hong

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Tianlin Li, Hanying Chen, Kun Wang, Yifei Hao, Le Zhang, Kenji Watanabe, Takashi Taniguchi, Xia Hong. Transport Anisotropy in One-Dimensional Graphene Superlattice in the High Kronig-Penney Potential Limit. Physical Review Letters. 2024, 132 (5), 056204. https://doi.org/10.1103/physrevlett.132.056204

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(abstract)

One-dimensional graphene superlattice subjected to strong Kronig-Penney (KP) potential is promising for achieving the electron-lensing effect, while previous studies utilizing the modulated dielectric gates can only yield a moderate, spatially dispersed potential profile. Here, we realize high KP potential modulation of graphene via nanoscale ferroelectric domain gating. Graphene transistors are fabricated on PbZr0.2Ti0.8O3 back-gates patterned with periodic, 100-200 nm wide stripe domains. Due to band reconstruction, the h-BN top-gating induces satellite Dirac points in samples with current along the superlattice vector 𝑠̂, a feature absent in samples with current perpendicular to 𝑠̂. The satellite Dirac point position scales with the superlattice period (L) as ∝ 𝐿𝛽, with β = -1.18±0.06. These results can be well explained by the high KP potential scenario, with the Fermi velocity perpendicular to 𝑠̂ quenched to about 1% of that for pristine graphene. Our study presents a promising material platform for realizing electron supercollimation and investigating flat band phenomena.

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Keyword: Graphene superlattice, Kronig-Penney potential, Satellite Dirac points

Date published: 2024-01-31

Publisher: American Physical Society (APS)

Journal:

  • Physical Review Letters (ISSN: 10797114) vol. 132 issue. 5 056204

Funding:

  • U.S. Department of Energy DE-SC0016153
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • Ministry of Education, Culture, Sports, Science and Technology
  • National Science Foundation ECCS: 2025298
  • NSF EPSCoR OIA-2044049
  • World Premier International Research Center Initiative
  • Nebraska Research Initiative
  • Nebraska Center for Energy Sciences Research

Manuscript type: Author's version (Accepted manuscript)

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First published URL: https://doi.org/10.1103/physrevlett.132.056204

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Updated at: 2025-08-28 08:30:27 +0900

Published on MDR: 2025-08-28 08:18:02 +0900

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