Non-Destructive Low-Temperature Contacts to MoS2 Nanoribbon and Nanotube Quantum Dots

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R.T.K. Schock, J. Neuwald, W. Möckel, M. Kronseder, L. Pirker, M. Remškar, A.K. Hüttel

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Advanced Materials 35, 2209333 (2023)

Molybdenum disulfide nanoribbons and nanotubes are quasi-1D semiconductors with strong spin–orbit interaction, a nanomaterial highly promising for quantum electronic applications. Here, it is demonstrated that a bismuth semimetal layer between the contact metal and this nanomaterial strongly improves the properties of the contacts. Two-point resistances on the order of 100 kΩ are observed at room temperature. At cryogenic temperature, Coulomb blockade is visible. The resulting stability diagrams indicate a marked absence of trap states at the contacts and the corresponding disorder, compared to previous devices that use low-work-function metals as contacts. Single-level quantum transport is observed at temperatures below 100 mK.

https://onlinelibrary.wiley.com/doi/10.1002/adma.202209333