  We study the effect of two non-interacting impurity atoms near by a
one-dimensional nanowire, which is modeled as a tight-binding hopping model.
The virtual single-electron hopping between two impurities will induce an
additional energy depending on the distance of two impurities, which gives a
electronic Casimir-Polder effect. We find that the Casimir-Polder force between
the two impurities decreases with the impurity-impurity distance exponentially.
And the effects of nanowire and finite temperature on the Casimir-Polder force
are also discussed in detail, respectively.
