  The Berry curvature of a Bloch band can be interpreted as a local magnetic
field in reciprocal space. This analogy can be extended by defining an electric
field analog in reciprocal space which arises from the time-dependent Berry
connection. We explore the term in the semi-classical equation of motion that
gives rise to this phenomenon, and show that it can lead to anomalous drift in
wave packet motion. A similar effect arises from changes in the band population
due to periodic driving, where the resulting drift depends on the nature of the
drive and can be expressed in terms of a shift vector. Finally, these effects
can be combined to build a pump with a net anomalous drift during a cyclic
evolution in momentum space.
