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Article Dans Une Revue Nature Communications Année : 2019

The valley Nernst effect in WSe2

Thomas Guillet
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Matthieu Jamet

Résumé

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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Origine : Publication financée par une institution

Dates et versions

hal-02552349 , version 1 (16-11-2020)

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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, 2019, 10 (1), ⟨10.1038/s41467-019-13590-8⟩. ⟨hal-02552349⟩
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