Zusammenfassung
Monolayer PtSe2 is a semiconducting transition-metal dichalcogenide characterized by an indirect band gap, space inversion symmetry, and high carrier mobility. Strong intrinsic spin-orbit coupling and the possibility to induce extrinsic spin-orbit fields by gating make PtSe2 attractive for fundamental spin transport studies as well as for potential spintronics applications. We perform a ...
Zusammenfassung
Monolayer PtSe2 is a semiconducting transition-metal dichalcogenide characterized by an indirect band gap, space inversion symmetry, and high carrier mobility. Strong intrinsic spin-orbit coupling and the possibility to induce extrinsic spin-orbit fields by gating make PtSe2 attractive for fundamental spin transport studies as well as for potential spintronics applications. We perform a systematic theoretical study of the spin-orbit coupling and spin relaxation in this material. Specifically, we employ first-principles methods to obtain the basic orbital and spin-orbital properties of PtSe2, also in the presence of an external transverse electric field. We calculate the spin mixing parameters b(2) and the spin-orbit fields Omega for the Bloch states of electrons and holes. This information allows us to predict the spin lifetimes due to the Elliott-Yafet and D'yakonov-Perel mechanisms. We find that b(2) is rather large, on the order of 10(-2) and 10(-1), while Omega varies strongly with doping, being about 10(3)-10(4) ns(-1) for carrier density in the interval 10(13)-10(14) cm(-2) at the electric field of 1 V/nm. We estimate the spin lifetimes to be on the picosecond level.
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