Landau levels of bilayer graphene in a WSe2/bilayer graphene van der Waals heterostructure

Ya Wen Chuang, Jing Li, Hailong Fu, Kenji Watanabe, Takashi Taniguchi, Jun Zhu

Research output: Contribution to journalArticle

Abstract

Heterostructures formed between two different van der Waals materials enable interactions and functionalities absent in each component. In this work we show that vicinity to an atomically thin WSe2 sheet dramatically impacts the energies of the symmetry-broken low Landau levels of bilayer graphene, possibly due to Coulomb screening. We present a systematic study of the magnetic field and electrical displacement field dependences of the Landau level gaps at filling factor ν=1, 2, 3, and compare to boron nitride encapsulated pristine bilayer graphene. The exchange-dominated energy splitting between the N=0 and 1 orbital wave functions is significantly enhanced, which leads to a modified phase diagram at filling factor ν=0 and larger energy gaps at ν=1 and 3 in WSe2/bilayer graphene heterostructures. The exchange-enhanced spin gap at ν=2, on the other hand, is reduced by approximately twofold. Our results demonstrate a possible way to engineer quantum Hall phenomena via van der Waals heterostructures.

Original languageEnglish (US)
Article number195402
JournalPhysical Review B
Volume100
Issue number19
DOIs
StatePublished - Nov 4 2019

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Graphene
Heterojunctions
graphene
Boron nitride
boron nitrides
Wave functions
engineers
Phase diagrams
broken symmetry
Screening
Energy gap
screening
energy transfer
phase diagrams
wave functions
Magnetic fields
Engineers
orbitals
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Chuang, Ya Wen ; Li, Jing ; Fu, Hailong ; Watanabe, Kenji ; Taniguchi, Takashi ; Zhu, Jun. / Landau levels of bilayer graphene in a WSe2/bilayer graphene van der Waals heterostructure. In: Physical Review B. 2019 ; Vol. 100, No. 19.
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Landau levels of bilayer graphene in a WSe2/bilayer graphene van der Waals heterostructure. / Chuang, Ya Wen; Li, Jing; Fu, Hailong; Watanabe, Kenji; Taniguchi, Takashi; Zhu, Jun.

In: Physical Review B, Vol. 100, No. 19, 195402, 04.11.2019.

Research output: Contribution to journalArticle

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AU - Chuang, Ya Wen

AU - Li, Jing

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AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Zhu, Jun

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