Hexagonal warping induced nonlinear planar Nernst effect in nonmagnetic topological insulators

We propose theoretically an effect, i.e., the nonlinear planar Nernst effect (NPNE), in nonmagnetic topological insulator (TI) Bi2Te3 in the presence of an in-plane magnetic field. We find that the Nernst current scales quadratically with temperature gradient but linearly with magnetic field and exh...

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Published in:Physical review. B 2021-01, Vol.103 (3), p.035410, Article 035410
Main Authors: Yu, Xiao-Qin, Zhu, Zhen-Gang, Su, Gang
Format: Article
Language:English
Subjects:
Bismuth tellurides
Broken symmetry
Locking
Magnetic fields
Nernst-Ettingshausen effect
Spintronics
Topological insulators
Warping
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description We propose theoretically an effect, i.e., the nonlinear planar Nernst effect (NPNE), in nonmagnetic topological insulator (TI) Bi2Te3 in the presence of an in-plane magnetic field. We find that the Nernst current scales quadratically with temperature gradient but linearly with magnetic field and exhibits a cosine dependence on the orientation of the magnetic field with respect to the direction of the temperature gradient. The NPNE has a quantum origin arising from the conversion of a nonlinear transverse spin current to a charge current due to a joint result of hexagonal warping effect, spin-momentum locking, and the time-reversal symmetry breaking induced by the magnetic field.
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subjects Bismuth tellurides
Broken symmetry
Locking
Magnetic fields
Nernst-Ettingshausen effect
Spintronics
Topological insulators
Warping
title Hexagonal warping induced nonlinear planar Nernst effect in nonmagnetic topological insulators
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