First-Principles Study on the Effect of Strain on Single-Layer Molybdenum Disulfide

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Materials Science

Background:

• Molybdenum disulfide (MoS2) is a 2D material with unique electronic properties.
• Understanding its behavior under mechanical stress is crucial for device applications.

Purpose of the Study:

• To investigate the electronic structure of single-layer MoS2 under biaxial strain.
• To explore the impact of strain on band gap, density of states, and other properties.

Main Methods:

• First-principles calculations using the plane wave pseudopotential method.
• Density functional theory (DFT) was employed for electronic structure analysis.

Main Results:

• Biaxial strain transforms the direct band gap of MoS2 to an indirect band gap.
• The indirect band gap decreases linearly with increasing strain.
• Analysis of density of states and thermodynamic parameters reveals strain-dependent variations.

Conclusions:

• Strain significantly alters the electronic band structure of single-layer MoS2.
• This study provides a theoretical foundation for strain-based modulation of MoS2 properties.