Non-Destructive Low-Temperature Contacts to MoS 2 Nanoribbon and Nanotube Quantum Dots.

Molybdenum disulfide nanoribbons and nanotubes are quasi-one dimensional semiconductors with strong spin-orbit interaction, a nanomaterial highly promising for quantum electronic applications. Here, we demonstrate 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 which use low-work function metals as contacts. Single level quantum transport is observed at temperatures below 100 mK. Graphical Abstract Molybdenum disulfide nanoribbons and nanotubes grown from vapour phase are a low defect density nanomaterial highly promising for quantum electronic applications. Devices integrating them with bismuth-based contacts show strongly reduced contact resistances and a marked absence of trap states at cryogenic temperatures. This allows for quantum dot Coulomb blockade measurements. Single level quantum transport is observed at temperatures below 100mK. This article is protected by copyright. All rights reserved.