  In symmetry-broken crystalline solids, pole structures of Berry curvature
(BC) can emerge, and they have been utilized as a versatile tool for
controlling transport properties. For example, the monopole component of the BC
is induced by the time-reversal symmetry breaking, and the BC dipole arises
from a lack of inversion symmetry, leading to the anomalous Hall and nonlinear
Hall effects, respectively. Based on first-principles calculations, we show
that the ferroelectricity in a tin telluride monolayer produces a unique BC
distribution, which offers charge- and spin-controllable photocurrents. Even
with the sizable band gap, the ferroelectrically driven BC dipole is comparable
to those of small-gap topological materials. By manipulating the photon
handedness and the ferroelectric polarization, charge and spin circular
photogalvanic currents are generated in a controllable manner. The
ferroelectricity in group-IV monochalcogenide monolayers can be a useful tool
to control the BC dipole and the nonlinear optoelectronic responses.
