  Friction at water-carbon interfaces remains a major puzzle with theories and
simulations unable to explain experimental trends in nanoscale waterflow. A
recent theoretical framework -- quantum friction (QF)-- proposes to resolve
these experimental observations by considering nonadiabatic coupling between
dielectric fluctuations in water and graphitic surfaces. Here, using a
classical model that enables fine-tuning of the solid's dielectric spectrum, we
provide evidence from simulations in general support of QF. In particular, as
features in the solid's dielectric spectrum begin to overlap with water's
librational and Debye modes, we find an increase in friction in line with that
proposed by QF. At the microscopic level, we find that this contribution to
friction manifests more distinctly in the dynamics of the solid's charge
density than that of water. Our findings suggest that experimental signatures
of QF may be more pronounced in the solid's response rather than liquid
water's.
