Non‐Destructive Low‐Temperature Contacts to MoS<sub>2</sub> Nanoribbon and Nanotube Quantum Dots
Robin T. K. Schock, Jonathan Neuwald, Wolfgang Möckel, M. Kronseder, Luka Pirker, Maja Remškar, A. K. Hüttel
Abstract
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.