Plasmonic hot electron induced structural phase transition in a MoS2 monolayer

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Molybdenum disulfide (MoS2) is a 2D material with unique electronic and optical properties.
• Phase transitions in MoS2 can significantly alter its properties, but controlled, reversible transitions are challenging.
• Plasmonic hot electrons offer a potential pathway for light-driven material modifications.

Purpose of the Study:

• To demonstrate a reversible 2H-to-1T phase transition in a MoS2 monolayer.
• To investigate the control of this phase transition using plasmonic hot electrons.
• To explore the potential of this phenomenon for optoelectronic device applications.

Main Methods:

• Utilized plasmonic hot electrons generated by incident light to induce phase transitions in MoS2 monolayers.
• Investigated the influence of light intensity, wavelength, and sample geometry on the phase transition.
• Analyzed the resulting changes in photoluminescence as an indicator of the phase transition.

Main Results:

• Successfully achieved a reversible 2H-to-1T phase transition in MoS2 monolayers.
• Demonstrated active control over the phase transition by manipulating light parameters (intensity, wavelength).
• Observed an effective shift in photoluminescence, correlated with the phase transition and controllable by light.

Conclusions:

• Plasmonic hot electrons provide an effective method for controlling reversible phase transitions in MoS2 monolayers.
• The light-tunable nature of this transition opens new possibilities for advanced optical functionalities.
• This work lays the foundation for developing novel plasmonic optoelectronic devices based on MoS2.