Abstract
By dual gating a few-layer flake, we induce spatially separated electronic states showing superconductivity and Shubnikov–de Haas (SdH) oscillations. While the highly confined superconductivity forms at the valleys of the topmost layer, the SdH oscillations are contributed by the electrons residing in the valleys of the rest of the bottom layers, which is confirmed by the extracted Landau level degeneracy of 3, electron effective mass of , and carrier density of . Mimicking conventional heterostructures, the interaction between the heteroelectronic states can be electrically manipulated, which enables “bipolarlike” superconducting transistor operation. The off-on-off switching pattern can be continuously accessed at low temperatures by a field effect depletion of carriers with a negative back gate bias and the proximity effect between the top superconducting layer and the bottom metallic layers that quenches the superconductivity at a positive back gate bias.
- Received 10 April 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.147002
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
The Dichalcogenide Gets Two Faces
Published 5 October 2017
Electric fields applied on either side of a thin, semiconducting transition-metal dichalcogenide create a superconducting layer atop a metallic layer within the material.
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