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Scanning gate microscopy of ultra clean carbon nanotube quantum dots

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arxiv 1508.05462 v1 pith:7BNRHJA7 submitted 2015-08-22 cond-mat.mes-hall

Jiamin Xue , Rohan Dhall , Stephen B. Cronin , Brian J. LeRoy This is my paper · ORCID
classification cond-mat.mes-hall
keywords quantumdotscarboncleangateidentifiedmicroscopynanotube
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We perform scanning gate microscopy on individual suspended carbon nanotube quantum dots. The size and position of the quantum dots can be visually identified from the concentric high conductance rings. For the ultra clean devices used in this study, two new effects are clearly identified. Electrostatic screening creates non-overlapping multiple sets of Coulomb rings from a single quantum dot. In double quantum dots, by changing the tip voltage, the interactions between the quantum dots can be tuned from the weak to strong coupling regime.

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  1. Isotropic charge screening of the anisotropic black phosphorus revealed by potassium adatoms

    cond-mat.mes-hall 2019-08 conditional novelty 7.0 of 10

    Scanning tunneling microscopy of potassium adatoms shows that electrostatic screening of point charges in black phosphorus is isotropic, despite the strongly anisotropic band structure.

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