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Proximity-Induced Superconductivity in Monolayer MoS2.
Daniel J Trainer1, BaoKai Wang2, Fabrizio Bobba1,3
1Physics Department, Temple University, Philadelphia, Pennsylvania 19122, United States.
ACS Nano
|January 14, 2020
Summary
Researchers induced superconductivity in pristine monolayer molybdenum disulfide (MoS2) using a lead (Pb) thin film. This proximity effect creates a tunable superconducting layer in MoS2 for advanced electronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Proximity effects in superconducting-normal (SN) heterostructures are well-established.
- Previous studies used doped, thicker semiconducting layers.
Purpose of the Study:
- To investigate proximity effects in pristine, single-layer MoS2 on a Pb thin film.
- To understand the mechanism of induced superconductivity in 2D materials.
Main Methods:
- Scanning tunneling microscopy and spectroscopy (STM/STS).
- Theoretical analysis using electronic structure calculations and Green's function modeling.
- Fabrication of SN heterostructures with monolayer MoS2 and Pb thin films.
Main Results:
- A two-step process was observed: MoS2 first became metallic, then superconducting.
- A topographic moiré pattern emerged due to lattice mismatch.
- Tunneling spectra showed a spatially modulated coherence peak height, forming a shifted moiré pattern.
Conclusions:
- The spatial modulation of induced superconductivity originates from the SN interface atomic structure and local orbitals.
- Geometrical tuning offers control over induced superconductivity in MoS2.
- This work shows potential for integrating monolayer superconductors into next-generation electronics via proximity-effect control.
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