Topological nonlinear anomalous Nernst effect in strained transition metal dichalcogenides

Xiao Qin Yu, Zhen Gang Zhu, Jhih Shih You, Tony Low, Gang Su

Research output: Contribution to journalArticle

Abstract

We theoretically analyze the nonlinear anomalous Nernst effect as the second-order response of temperature gradient by using the semiclassical framework of electron dynamics. We find that a nonlinear current can be generated transverse to the applied temperature gradient in time-reversal-symmetry materials with broken inversion symmetry. This effect has a quantum origin arising from the Berry curvature of states near the Fermi surface. We discuss the nonlinear Nernst effect in transition metal dichalcogenides (TMDCs) under the application of uniaxial strain. In particular, we predict that under fixed chemical potential in TMDCs, the nonlinear Nernst current exhibits a transition from T-2 temperature dependence in low temperature regime to a linear T dependence in high temperature.

Original languageEnglish (US)
Article number201410
JournalPhysical Review B
Volume99
Issue number20
DOIs
StatePublished - May 20 2019

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Transition metals
transition metals
Thermal gradients
temperature gradients
axial strain
Fermi surface
Chemical potential
symmetry
Temperature
Fermi surfaces
curvature
inversions
temperature dependence
Electrons
electrons

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Topological nonlinear anomalous Nernst effect in strained transition metal dichalcogenides. / Yu, Xiao Qin; Zhu, Zhen Gang; You, Jhih Shih; Low, Tony; Su, Gang.

In: Physical Review B, Vol. 99, No. 20, 201410, 20.05.2019.

Research output: Contribution to journalArticle

Yu, Xiao Qin ; Zhu, Zhen Gang ; You, Jhih Shih ; Low, Tony ; Su, Gang. / Topological nonlinear anomalous Nernst effect in strained transition metal dichalcogenides. In: Physical Review B. 2019 ; Vol. 99, No. 20.
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