Nanoelectromechanical systems(NEMS)based on atomically-thin tungsten diselenide(WSe_(2)),benefiting from the excellent material properties and the mechanical degree of freedom,offer an ideal platform for studying and ...Nanoelectromechanical systems(NEMS)based on atomically-thin tungsten diselenide(WSe_(2)),benefiting from the excellent material properties and the mechanical degree of freedom,offer an ideal platform for studying and exploiting dynamic strain engineering and cross-scale vibration coupling in two-dimensional(2D)crystals.However,such opportunity has remained largely unexplored for WSe_(2)NEMS,impeding exploration of exquisite physical processes and realization of novel device functions.Here,we demonstrate dynamic coupling between atomic lattice vibration and nanomechanical resonances in few-layer WSe_(2)NEMS.Using a custom-built setup capable of simultaneously detecting Raman and motional signals,we accomplish cross-scale mode coupling between the THz crystal phonon and MHz structural vibration,achieving GHz frequency tuning in the atomic lattice modes with a dynamic gauge factor of 61.9,the best among all 2D crystals reported to date.Our findings show that such 2D NEMS offer great promises for exploring cross-scale physics in atomically-thin semiconductors.展开更多
基金support from the National Science Fund for Distinguished Young Scholars(Grant No.T2325007)Opening Foundation of Hubei Key Laboratory of MicroNanoelectronic Materials and Devices(Grant No.K202307)+3 种基金National Natural Science Foundation of China(Grant Nos.62450003,62404029,62401104,U21A20459,62250073,61774029)Opening Foundation of State key laboratory of precision measuring technology and instruments(Tianjin University)(Grant No.Pilab2411)China Postdoctoral Science Foundation(Grant Nos.GZB20230107,GZB20240109)Natural Science Foundation of Sichuan Province(Grant Nos.2024NSFSC1408,2024NSFSC1430).
文摘Nanoelectromechanical systems(NEMS)based on atomically-thin tungsten diselenide(WSe_(2)),benefiting from the excellent material properties and the mechanical degree of freedom,offer an ideal platform for studying and exploiting dynamic strain engineering and cross-scale vibration coupling in two-dimensional(2D)crystals.However,such opportunity has remained largely unexplored for WSe_(2)NEMS,impeding exploration of exquisite physical processes and realization of novel device functions.Here,we demonstrate dynamic coupling between atomic lattice vibration and nanomechanical resonances in few-layer WSe_(2)NEMS.Using a custom-built setup capable of simultaneously detecting Raman and motional signals,we accomplish cross-scale mode coupling between the THz crystal phonon and MHz structural vibration,achieving GHz frequency tuning in the atomic lattice modes with a dynamic gauge factor of 61.9,the best among all 2D crystals reported to date.Our findings show that such 2D NEMS offer great promises for exploring cross-scale physics in atomically-thin semiconductors.
