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Unidirectional Seebeck effect in magnetic topological insulators
Mesoscale and Nanoscale Physics · Submitted 19 Nov 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The USE has a quantum origin arising from the magnon asymmetric scattering of surface Dirac electrons on TI.
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The abstract, sentence by sentence
We theoretically investigate the temperature gradient-dependent or unidirectional Seebeck effect (USE) in a magnetic/ nonmagnetic topological insulator (TI) heterostructure with in-plane magnetization in terms of the semiclassical electron dynamics and Fermi golden rule. The USE has a quantum origin arising from the magnon asymmetric scattering of surface Dirac electrons on TI. We discuss the USE in the heterostructures, Cr$_{x}$(Bi$_{1-y}$Sb$_y$)$_{2-x}$Te$_{3}$/ (Bi$_{1-y}$Sb$_{y})_2$Te$_{3}$. The USE exhibits $\cos\phi$-dependence (measured from $y$-direction) on the orientation of magnetization. It's found that the sign of USE stays unchanged when the system is transferred from $p$-doping to $n$-doping. The USE shows on inverse-linearly temperature dependent at high temperature.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We theoretically investigate the temperature gradient-dependent or unidirectional Seebeck effect (USE) in a magnetic/ nonmagnetic topological insulator (TI) heterostructure with in-plane magnetization in terms of the semiclassical electron dynamics and Fermi golden rule. | contribution 0.99 | 0.92 | 0.12 | asserted 0.82 |
| s1 | The USE has a quantum origin arising from the magnon asymmetric scattering of surface Dirac electrons on TI. | interpretation 0.74 | 0.65 | 0.35 | asserted 1.00 |
| s2 | We discuss the USE in the heterostructures, Cr$_{x}$(Bi$_{1-y}$Sb$_y$)$_{2-x}$Te$_{3}$/ (Bi$_{1-y}$Sb$_{y})_2$Te$_{3}$. | contribution 0.97 | 0.57 | 0.04 | asserted 0.72 |
| s3 | The USE exhibits $\cos\phi$-dependence (measured from $y$-direction) on the orientation of magnetization. | result 1.00 | 0.85 | 0.15 | asserted 1.00 |
| s4 | It's found that the sign of USE stays unchanged when the system is transferred from $p$-doping to $n$-doping. | result 1.00 | 0.90 | 0.16 | asserted 1.00 |
| s5 | The USE shows on inverse-linearly temperature dependent at high temperature. | result 1.00 | 0.85 | 0.11 | asserted 1.00 |
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The paper
Original abstract
We theoretically investigate the temperature gradient-dependent or unidirectional Seebeck effect (USE) in a magnetic/ nonmagnetic topological insulator (TI) heterostructure with in-plane magnetization in terms of the semiclassical electron dynamics and Fermi golden rule. The USE has a quantum origin arising from the magnon asymmetric scattering of surface Dirac electrons on TI. We discuss the USE in the heterostructures, Cr$_{x}$(Bi$_{1-y}$Sb$_y$)$_{2-x}$Te$_{3}$/ (Bi$_{1-y}$Sb$_{y})_2$Te$_{3}$. The USE exhibits $\cos\phi$-dependence (measured from $y$-direction) on the orientation of magnetization. It's found that the sign of USE stays unchanged when the system is transferred from $p$-doping to $n$-doping. The USE shows on inverse-linearly temperature dependent at high temperature.
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