Symmetry regimes for circular photocurrents in monolayer MoSe2

Jorge Quereda (), Talieh S. Ghiasi, Jhih-Shih You, Jeroen Brink, Bart J. Wees and Caspar H. Wal
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Jorge Quereda: University of Groningen
Talieh S. Ghiasi: University of Groningen
Jhih-Shih You: IFW Dresden
Jeroen Brink: IFW Dresden
Bart J. Wees: University of Groningen
Caspar H. Wal: University of Groningen

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract In monolayer transition metal dichalcogenides helicity-dependent charge and spin photocurrents can emerge, even without applying any electrical bias, due to circular photogalvanic and photon drag effects. Exploiting such circular photocurrents (CPCs) in devices, however, requires better understanding of their behavior and physical origin. Here, we present symmetry, spectral, and electrical characteristics of CPC from excitonic interband transitions in a MoSe2 monolayer. The dependence on bias and gate voltages reveals two different CPC contributions, dominant at different voltages and with different dependence on illumination wavelength and incidence angles. We theoretically analyze symmetry requirements for effects that can yield CPC and compare these with the observed angular dependence and symmetries that occur for our device geometry. This reveals that the observed CPC effects require a reduced device symmetry, and that effects due to Berry curvature of the electronic states do not give a significant contribution.

Date: 2018
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DOI: 10.1038/s41467-018-05734-z

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