Abstract
We investigate the frictional forces due to quantum fluctuations, acting on a
small sphere rotating near a surface. At zero temperature, we find the
frictional force near a surface to be several orders of magnitude larger than
that for the sphere rotating in vacuum. For metallic materials with typical
conductivity, quantum friction is maximized by matching the frequency of
rotation with the conductivity. Materials with poor conductivity are favored to
obtain large quantum frictions. For semiconductor materials that are able to
support surface plasmon polaritons, quantum friction can be further enhanced by
several orders of magnitude due to the excitation of surface plasmon
polaritons.
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