Atomically Thin NEMS Frequency Comb with Both Frequency Tunability and Reconfigurable Via Simultaneous 1:2 and 1:3 Mode Coupling

We report a frequency comb via simultaneous internal resonances (1:2 & 1:3) in a nanoelectromechanical system (NEMS) resonator based on 2D semiconductor molybdenum disulfide (MoS
2
). By applying a single-tone excitation with amplitude V
ac
beyond the threshold and carefully setting the gate voltage V
g
, multiple internal resonances can be realized and equidistant spectral lines around the fundamental mode frequency are observed. The frequency spacing and the number of spectral lines can be tuned by the driving amplitude V
ac
, and switched between different configurations by the driving frequency f
d
. The combination of such resonant responses can be leveraged to realize NEMS frequency combs with high reconfigurability and fine tunability.