Frustrated supercritical collapse in tunable charge arrays on graphene

Jiong Lu; Hsin-Zon Tsai; Alpin N. Tatan; Sebastian Wickenburg; Arash A. Omrani; Dillon Wong; Alexander Riss; Erik Piatti; Kenji Watanabe; Takashi Taniguchi; Alex Zettl; Vitor M. Pereira; Michael F. Crommie

doi:10.1038/s41467-019-08371-2

ジャーナル論文 Frustrated supercritical collapse in tunable charge arrays on graphene

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Jiong Lu, Hsin-Zon Tsai, Alpin N. Tatan, Sebastian Wickenburg, Arash A. Omrani, Dillon Wong, Alexander Riss, Erik Piatti, Kenji Watanabe, Takashi Taniguchi, Alex Zettl, Vitor M. Pereira, Michael F. Crommie. Frustrated supercritical collapse in tunable charge arrays on graphene. Nature Communications. 2019, 10 (1), 477. https://doi.org/10.1038/s41467-019-08371-2

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(abstract)

We report bottom-up synthesis of atomically-precise one-dimensional (1D) arrays of point charges aimed at exploring supercritical confinement of carriers in graphene for new geometries. The arrays were synthesized by arranging F4TCNQ molecules into a 1D lattice on back-gated graphene devices, allowing precise tuning of both the molecular charge state and the array periodicity. Dilute arrays of ionized F4TCNQ molecules are seen to behave like isolated subcritical charges but dense arrays show emergent supercriticality. In contrast to compact supercritical clusters, extended 1D charge arrays exhibit both supercritical and subcritical characteristics and belong to a new physical regime termed frustrated supercritical collapse.

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