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Coexistence of electron whispering-gallery modes and atomic collapse states in graphene/WSe2 heterostructure quantum dots

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  • Qi Zheng

    (Beijing Normal University)

  • Yu-Chen Zhuang

    (Peking University)

  • Qing-Feng Sun

    (Peking University
    Collaborative Innovation Center of Quantum Matter
    Beijing Academy of Quantum Information Sciences)

  • Lin He

    (Beijing Normal University)

Abstract

The relativistic massless charge carriers with a Fermi velocity of about c/300 in graphene enable us to realize two distinct types of resonances (here, c is the speed of light in vacuum). One is the electron whispering-gallery mode in graphene quantum dots arising from the Klein tunneling of the massless Dirac fermions. The other is the atomic collapse state, which has never been observed in experiment with real atoms due to the difficulty of producing heavy nuclei with charge Z > 170; however, they can be realized near a Coulomb impurity in graphene with a charge Z ≥ 1 because of the “small” velocity of the Dirac excitations. Here we demonstrate that both the electron whispering-gallery modes and atomic collapse states coexist in graphene/WSe2 heterostructure quantum dots due to the Coulomb-like potential near their edges. By applying a perpendicular magnetic field, we explore the evolution from the atomic collapse states to unusual Landau levels in the collapse regime.

Suggested Citation

  • Qi Zheng & Yu-Chen Zhuang & Qing-Feng Sun & Lin He, 2022. "Coexistence of electron whispering-gallery modes and atomic collapse states in graphene/WSe2 heterostructure quantum dots," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29251-2
    DOI: 10.1038/s41467-022-29251-2
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    References listed on IDEAS

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    1. Chendong Zhang & Yuxuan Chen & Jing-Kai Huang & Xianxin Wu & Lain-Jong Li & Wang Yao & Jerry Tersoff & Chih-Kang Shih, 2016. "Visualizing band offsets and edge states in bilayer–monolayer transition metal dichalcogenides lateral heterojunction," Nature Communications, Nature, vol. 7(1), pages 1-6, April.
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