Superconducting contacts to a monolayer semiconductor

Abstract

We demonstrate superconducting vertical interconnect access (VIA) contacts to a monolayer of molybdenum disulfide (MoS${}_2$), a layered semiconductor with highly relevant electronic and optical properties. As a contact material we use MoRe, a superconductor with a high critical magnetic field and high critical temperature. The electron transport is mostly dominated by a single superconductor/normal conductor junction with a clear superconductor gap. In addition, we find MoS${}_2$ regions that are strongly coupled to the superconductor, resulting in resonant Andreev tunneling and junction dependent gap characteristics, suggesting a superconducting proximity effect. Magnetoresistance measurements show that the bandstructure and the high intrinsic carrier mobility remain intact in the bulk of the MoS${}_2$. This type of VIA contact is applicable to a large variety of layered materials and superconducting contacts, opening up a path to monolayer semiconductors as a platform for superconducting hybrid devices.

References in corpus (12)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Uncovering the Effects of Metal Contacts on Monolayer MoS2
• Intrinsic orbital and spin Hall effects in monolayer transition metal dichalcogenides
• Shadow-wall lithography of ballistic superconductor-semiconductor quantum devices
• Local electrical tuning of the nonlocal signals in a Cooper pair splitter
• InAs nanowire hot-electron Josephson transistor
• Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots
• Molybdenum-Rhenium alloy based high-$Q$ superconducting microwave resonators
• Anomalous Inner-Gap Structure in Transport Characteristics of Superconducting Junctions with Degraded Interfaces
• One-Dimensional Edge Contact to Encapsulated MoS2 with a Superconductor

Cited by in corpus (4)

• Crossed Andreev reflection in spin-polarized chiral edge states due to the Meissner effect
• Bipolar Thermoelectricity in Bilayer-Graphene--Superconductor Tunnel Junctions
• Evidence of Josephson coupling in a few-layer black phosphorus planar Josephson junction
• Tunneling Spectroscopy of Two-Dimensional Materials Based on Via Contacts