  Studies involving nanomechanical motion have evolved from its detection and
understanding of its fundamental aspects to its promising practical utility as
an integral component of hybrid systems. Nanomechanical resonators'
indispensable role as transducers between optical and microwave fields in
hybrid systems, such as quantum communications interface, have elevated their
importance in recent years. It is therefore crucial to determine which among
the family of nanomechanical resonators is more suitable for this role. Most of
the studies revolve around nanomechanical resonators of ultrathin structures
because of their inherently large mechanical amplitude due to their very low
mass. Here, we argue that the underutilized nanomechanical resonators made from
multilayered two-dimensional (2D) materials are the better fit for this role
because of their comparable electrostatic tunability and larger optomechanical
responsivity. To show this, we first demonstrate the electrostatic tunability
of mechanical modes of a multilayered nanomechanical resonator made from
graphite. We also show that the optomechanical responsivity of multilayered
devices will always be superior as compared to the few-layer devices. Finally,
by using the multilayered model and comparing this device with the reported
ones, we find that the electrostatic tunability of devices of intermediate
thickness is not significantly lower than that of ultrathin ones. Together with
the practicality in terms of fabrication ease and design predictability, we
contend that multilayered 2D nanomechanical resonators are the optimal choice
for the electromagnetic interface in integrated quantum systems.
