2019Journal of Physics: Materials

Contact transparency in mechanically assembled 2D material devices

Scott Mills, Naomi Mizuno, Peng Wang, Jian Lyu, Kenji Watanabe, Takashi Taniguchi, Fernando Camino, Liyuan Zhang, Xu Du

Journal of Physics: Materials · 2, 035003 (2019)

**AI thematic illustration**Concept artwork created for this paper.

Introduction

Two-dimensional crystals are mechanically transferred onto contacts to form junctions with superconductors. Transport measurements indicate comparable or better interface transparency than in conventionally patterned devices, with contact roughness a prominent limitation.

A closer reading

Preparing the contacts separately reduces processing of the more fragile crystal. The comparison also makes clear that avoiding processing damage is only part of the problem: roughness at the surface can still limit electronic transmission.