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

Jeongwoo Kim, Kyoung-Whan Kim, Dongbin Shin, Sang-Hoon Lee, Jairo Sinova, Noejung Park and Hosub Jin ()
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Jeongwoo Kim: Ulsan National Institute of Science and Technology
Kyoung-Whan Kim: Korea Institute of Science and Technology
Dongbin Shin: Ulsan National Institute of Science and Technology
Sang-Hoon Lee: Korea Institute for Advanced Study
Jairo Sinova: Johannes Gutenberg University Mainz
Noejung Park: Ulsan National Institute of Science and Technology
Hosub Jin: Ulsan National Institute of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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 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.

Date: 2019
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DOI: 10.1038/s41467-019-11964-6

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