Prediction of ferroelectricity-driven Berry curvature enabling charge- and spin-controllable photocurrent in tin telluride monolayers

• DOI: 10.1038/s41467-019-11964-6
• Publication Date: 2019-09-03T10:08:04Z
• Authors: Jeongwoo Kim; Kyoung-Whan Kim; Dongbin Shin; Sang-Hoon Lee; Jairo Sinova; Noejung Park; Hosub Jin
• Keywords: Point reflection; Tetragonal crystal system

Abstract 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 BC is induced by time-reversal symmetry breaking, dipole arises from lack inversion symmetry, leading to anomalous Hall nonlinear effects, respectively. Based on first-principles calculations, we show that ferroelectricity in tin telluride monolayer produces unique distribution, which offers charge- spin-controllable photocurrents. Even with sizable band gap, ferroelectrically driven comparable those small-gap topological materials. By manipulating photon handedness ferroelectric polarization, charge spin circular photogalvanic currents are generated controllable manner. The group-IV monochalcogenide monolayers be useful control optoelectronic responses.