Thermally Driven Pure Spin and Valley Currents via the Anomalous Nernst Effect in Monolayer Group-VI Dichalcogenides

Xiao-Qin Yu, Zhen-Gang Zhu, Gang Su, Antti-Pekka Jauho

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Abstract

The spin and valley-dependent anomalous Nernst effects are analyzed for monolayer MoS2 and other group-VI dichalcogenides. We find that pure spin and valley currents can be generated perpendicular to the applied thermal gradient in the plane of these two-dimensional materials. This effect provides a versatile platform for applications of spin caloritronics. A spin current purity factor is introduced to quantify this effect. When time reversal symmetry is violated, e.g., two-dimensional materials on an insulating magnetic substrate, a dip-peak feature appears for the total Nernst coefficient. For the dip state it is found that carriers with only one spin and from one valley are driven by the temperature gradient.
Original languageEnglish
Article number246601
JournalPhysical Review Letters
Volume115
Issue number24
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2015

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© 2015 American Physical Society

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