Making Patterned Single Defects in MoS₂ Thermally with the MoS₂/Au Moiré Interface.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Quantum Engineering

Background:

• Precisely controlling thermal defects in host lattices is challenging due to stochastic thermal activation.
• Defect engineering in 2D materials like molybdenum disulfide (MoS2) is crucial for quantum applications.

Purpose of the Study:

• To demonstrate a method for creating precisely patterned single sulfur vacancy (VS) defects in monolayer MoS2.
• To elucidate the mechanisms governing the formation and patterning of these defects.

Main Methods:

• Utilized a thermal annealing approach on monolayer MoS2.
• Investigated the role of the sulfur-antimony (S-Au) interface coupling.
• Analyzed phonon-defect interactions and moiré interface effects.

Main Results:

• Achieved subnanometer accuracy in creating patterned single sulfur vacancy (VS) defects with approximately 2 nm separations.
• Revealed that S-Au interface coupling lowers energy barriers for VS defect formation.
• Discovered a phonon regulation mechanism mediated by the moiré interface that directs VS formation to specific moiré sites.

Conclusions:

• Developed a high-throughput method for nanoscale defect patterning in MoS2.
• The findings provide insights into defect formation mechanisms at interfaces and under moiré superlattices.
• This work paves the way for scalable defect-based quantum systems.