The valley Nernst effect in WSe2

Minh Tuan Dau (), Céline Vergnaud, Alain Marty, Cyrille Beigné, Serge Gambarelli, Vincent Maurel, Timotée Journot, Bérangère Hyot, Thomas Guillet, Benjamin Grévin, Hanako Okuno and Matthieu Jamet ()
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Minh Tuan Dau: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC
Céline Vergnaud: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC
Alain Marty: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC
Cyrille Beigné: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC
Serge Gambarelli: Univ. Grenoble Alpes, CEA, CNRS, IRIG-SyMMES
Vincent Maurel: Univ. Grenoble Alpes, CEA, CNRS, IRIG-SyMMES
Timotée Journot: Univ. Grenoble Alpes, CEA, LETI, MINATEC Campus
Bérangère Hyot: Univ. Grenoble Alpes, CEA, LETI, MINATEC Campus
Thomas Guillet: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC
Benjamin Grévin: Univ. Grenoble Alpes, CEA, CNRS, IRIG-SyMMES
Hanako Okuno: Univ. Grenoble Alpes, CEA, IRIG-MEM
Matthieu Jamet: Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: 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 WSe$${}_{2}$$2 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 WSe$${}_{2}$$2 that we detect electrically at room temperature. The valley Nernst coefficient is in good agreement with the predicted value.

Date: 2019
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DOI: 10.1038/s41467-019-13590-8

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