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Controlling the spin and valley degeneracy splitting in monolayer MnPSe3 by atom doping

Abstract

Monolayer manganese chalcogenophosphates MnPSe3 possess a pair of non-degenerate energy valleys in the vicinities of the vertices of the hexagonal Brillouin zone, which exhibit fascinating optical valley polarization. However, the spin is still degenerate due to antiferromagnetic coupling between Mn ions. In this paper we propose a strategy to realize simultaneously the spin and valley degeneracy splitting by the doping-induced Zeeman effect in monolayer MnPSe3. By the first-principles calculation we demonstrate that in the Zn-doped monolayer MnPSe3 the valley splitting larger than 20 meV and the spin splitting larger than 100 meV can be achieved simultaneously. The doping-induced spin and valley splitting is attractive for spintronics and valleytronics as it creates the differences in various energy scales between valleys and between spins, which will facilitate the access and manipulation of the valley and spin degrees of freedom by electric gating in addition to optic pumping.

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Publication details

The article was received on 13 Feb 2017, accepted on 15 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7CP00964J
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Controlling the spin and valley degeneracy splitting in monolayer MnPSe3 by atom doping

    L. Zhong, X. Chen and J. Qi, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP00964J

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