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The valley Nernst effect in WSe2

Abstract : The Hall effect can be extended by inducing a temperature gradient in lieu of electric field that is known as the Nernst (-Ettingshausen) effect. The recently discovered spin Nernst effect in heavy metals continues to enrich the picture of Nernst effect-related phenomena. However, the collection would not be complete without mentioning the valley degree of freedom benchmarked by the valley Hall effect. Here we show the experimental evidence of its missing counterpart, the valley Nernst effect. Using millimeter-sized WSe2 mono-multi- layers and the ferromagnetic resonance-spin pumping technique, we are able to apply a temperature gradient by off-centering the sample in the radio frequency cavity and address a single valley through spin-valley coupling. The combination of a temperature gradient and the valley polarization leads to the valley Nernst effect in WSe2 that we detect electrically at room temperature. The valley Nernst coefficient is in good agreement with the predicted value.
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https://hal.archives-ouvertes.fr/hal-02552349
Contributor : Alain Marty Connect in order to contact the contributor
Submitted on : Monday, November 16, 2020 - 3:53:15 PM
Last modification on : Wednesday, May 19, 2021 - 1:10:06 PM
Long-term archiving on: : Wednesday, February 17, 2021 - 7:28:37 PM

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Minh Tuan Dau, Céline Vergnaud, Marty A., Cyrille Beigne, Serge Gambarelli, et al.. The valley Nernst effect in WSe2. Nature Communications, Nature Publishing Group, 2019, 10 (1), ⟨10.1038/s41467-019-13590-8⟩. ⟨hal-02552349⟩

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