Thermally-modulated dissipation dilution in 2D NEMS resonators with explicit model and temperature-stable damping

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Strain-diluted dissipation is a key technique for tuning the quality (Q) factor in resonant nanoelectromechanical systems (NEMS).
• Understanding and controlling temperature-dependent dissipation dilution in two-dimensional (2D) NEMS resonators remains a challenge.

Purpose of the Study:

• To investigate temperature-modulated dissipation dilution mechanisms in 2D NEMS resonators.
• To develop a predictive model for dissipation dilution under varying temperatures.
• To design and demonstrate a NEMS resonator with enhanced thermal stability.

Main Methods:

• Development of an explicit temperature-dependent dissipation dilution model.
• Experimental characterization of graphene and molybdenum disulfide (MoS2) resonators across a temperature range (77 K to 355 K).
• Design and fabrication of a graphene-MoS2 heterostructure resonator.

Main Results:

• The model accurately captures experimental observations of Q factor variations with temperature in graphene and MoS2 resonators.
• Graphene resonators showed a decrease then increase in Q factor, while MoS2 resonators exhibited a monotonic decrease.
• The designed graphene-MoS2 heterostructure demonstrated high temperature stability in frequency and Q factor.

Conclusions:

• The study advances the understanding of dissipation dilution mechanisms in 2D NEMS.
• The findings pave the way for developing thermally stable resonant transducers and logic components.
• Precise control over temperature effects is crucial for NEMS applications.