Nonlinear coupling of closely spaced modes in atomically thin MoS2 nanoelectromechanical resonators
Year: 2024
Type: article
Abstract: Nanoelectromechanical systems (NEMS) incorporating atomic or molecular layer van der Waals materials can support multimode resonances and exotic nonlinear dynamics. Here we investigate nonlinear coupling of closely spaced modes in a bilayer (2L) molybdenum disulfide (MoS 2 ) nanoelectromechanical resonator. We model the response from a drumhead resonator using equations of two resonant modes with a dispersive coupling term to describe the vibration induced frequency shifts that result from the induced change in tension. We employ method of averaging to solve the equations of coupled modes and extract an expression for the nonlinear coupling coefficient ( λ ) in closed form. Undriven thermomechanical noise spectral measurements are used to calibrate the vibration amplitude of mode 2 ( a 2 ) in the displacement domain. We drive mode 2 near its natural frequency and measure the shifted resonance frequency of mode 1 ( f 1s ) resulting from the dispersive coupling. Our model yields λ = 0.027 ± 0.005 pm −2 · μs −2 from thermomechanical noise measurement of mode 1. Our model also captures an anomalous frequency shift of the undriven mode 1 due to nonlinear coupling to the driven mode 2 mediated by large dynamic tension. This study provides a direct means to quantifying λ by measuring the thermomechanical noise in NEMS and will be valuable for understanding nonlinear mode coupling in emerging resonant systems.
Source: Microsystems & Nanoengineering
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,290
Awards: Collaborative Research: Innovating Quantum-Inspired Learning for Undergraduates in Research and Engineering, QuSeC-TAQS: Driving Advances in Magnetic Materials and Devices with Quantum Sensing of Magnons, THE PURPOSE OF THIS COOPERATIVE AGREEMENT IS TO FUND RESEARCH IN SUPPORT OF THE DEFENSE ADVANCED RESEARCH PROJECTS AGENCY DARPA MICROSYSTEMS TECHNOLOGY OFFICE MTO FOR THE H6 PROGRAM. THIS EFFORT SHALL BE CARRIED OUT GENERALLY AS SET FORTH IN THE RECIPIENTS RESEARCH DESCRIPTION DOCUMENT RDD, EXHIBIT B, WHICH HAS BEEN BASED ON THE RECIPIENTS PROPOSAL ENTITLED OUTATIME OVENIZED ULTRASTABLE TACTICAL TIMING WITH MECHANICS DATED AUGUST 8, 2022, AS AMENDED ON NOVEMBER 11, 2022, COPIES OF WHICH ARE IN THE POSSESSION OF BOTH PARTIES., G8303626243
OpenAlex ID: W4405823657