Bifurcation amplifiers are known for their extremely high sensitivity to weak input signals. We implement a bifurcation amplifier by harnessing the Duffing nonlinearity in a parametrically excited MoS2 nano-electromechanical system. We utilize the ultra-sensitive switching response between the two states of the bifurcation amplifier to detect as well as register charge-fluctuation events. We demonstrate open-loop real-time detection of ultra-low electrical charge perturbations of magnitude <10 e at room temperature. Furthermore, we show latching of the resonator onto one of the two states in response to short-lived charge fluctuations. These charge detectors offer advantages of room-temperature operation and tunable operation in the radio frequency regime, which could open several possibilities in quantum sensing.
Ultra-sensitive charge detection and latch memory using MoS2-nanoresonator-based bifurcation amplifiers
Aneesh Dash, Swapnil K. More, Nishta Arora, A. K. Naik; Ultra-sensitive charge detection and latch memory using MoS2-nanoresonator-based bifurcation amplifiers. Appl. Phys. Lett. 1 February 2021; 118 (5): 053105. https://doi.org/10.1063/5.0031890
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