A direct external input energy source (e.g., light, chemical
reaction,
redox potential, etc.) is compulsory to supply energy to rotary motors
for accomplishing rotation around the axis. The stator leads the direction
of rotation, and a sustainable rotation requires two mutual input
energy supplies (e.g., light and heat, light and pH or metal ion,
etc.); however, there are some exceptions (e.g., covalent single bond
rotors and/or motors). On the contrary, our experiment suggested that
double ratchet rotary motors (DRMs) can harvest power from available
thermal noise, kT, for sustainable rotation around the axis. Under
a scanning tunneling microscope, we have imaged live thermal noise
movement as a dynamic orbital density and resolved the density diagram
up to the second derivative. A second input energy can synchronize
multiple rotors to afford a measurable output. Therefore, we hypothesized
that rotation control in a DRM must be evolved from an orbital-level
information transport channel between the two coupled rotors but was
not limited to the second input energy. A DRM comprises a Brownian
rotor and a power stroke rotor coupled to a −CC–
stator, where the transport of information through coupled orbitals
between the two rotors is termed the vibrational information flow
chain (VIFC). We test this hypothesis by studying the DRM’s
density functional theory calculation and variable-temperature 1H nuclear magnetic resonance. Additionally, we introduced
inbuilt pawl-like functional moieties into a DRM to create different
electronic environments by changing proton intercalation interactions,
which gated information processing through the VIFC. The results show
the VIFC can critically impact the motor’s noise harvesting,
resulting in variable rotational motions in DRMs.