Quantum Materials Corp. (fka QTMM)

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Tunable Magnetism and Half-Metallicity in Hole-doped Monolayer GaSe

Ting Cao, Zhenglu Li, Steven G. Louie

(Submitted on 14 Sep 2014)

We find, through first-principles calculations, that hole doping induces a ferromagnetic phase transition in monolayer GaSe. Upon increasing hole density, the average spin magnetic moment per carrier increases and reaches a plateau near 1.0 µB/carrier in a range of 3×1013/cm2-1×1014/cm2 with the system in a half-metal state before the moment starts to descend abruptly. The predicted magnetism originates from an exchange splitting of electronic states at the top of the valence band where the density of states exhibits a sharp van Hove singularity in this quasi-two-dimensional system.

http://arxiv.org/abs/1409.4112