Tunable nonlinear damping in parametric regime

TL;DR

This paper investigates nonlinear damping in a tunable MoS2 nanoresonator, revealing enhanced damping near internal resonance and demonstrating its potential for studying nonlinear physics in 2D materials.

Contribution

It reports the first experimental observation of tunable nonlinear damping in a 2D material nanoresonator using electrical homodyne detection.

Findings

Enhanced nonlinear damping observed near internal resonance

Tunable resonance frequency allows control of nonlinear effects

Nonlinear damping characterized via parametric gain

Abstract

Nonlinear damping plays a significant role in several area of physics and it is becoming increasingly important to understand its underlying mechanism. However, microscopic origin of nonlinear damping is still a debatable topic. Here, we probe and report nonlinear damping in a highly tunable MoS2 nano mechanical drum resonator using electrical homodyne actuation and detection technique. In our experiment, we achieve 2:1 internal resonance by tuning resonance frequency and observe enhanced non-linear damping. We probe the effect of non-linear damping by characterizing parametric gain. Geometry and tunability of the device allow us to reduce the effect of other prominent Duffing non-linearity to probe the non-linear damping effectively. The enhanced non-linear damping in the vicinity of internal resonance is also observed in direct drive, supporting possible origin of non-linear damping. Our experiment demonstrates, a highly tunable 2D material based nanoresonator offers an excellent platform to study the nonlinear physics and exploit nonlinear damping in parametric regime.