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.

Center for Spintronics Korea Institute of Science and Technology Seoul 02792 Korea

Department of Physics Incheon National University Incheon 22012 Korea

Department of Physics Ulsan National Institute of Science and Technology Ulsan 44919 Korea

Institute of Physics Academy of Sciences of the Czech Republic Cukrovarnická 10 162 53 Praha 6 Czech Republic

Institute of Physics Johannes Gutenberg University Mainz Mainz 55099 Germany

Korea Institute for Advanced Study Seoul 02455 Korea

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