Photo-induced spin and valley-dependent Seebeck effect in the low-buckled Dirac materials

Employing the Landauer-Buttiker formula we investigate the spin and valley dependence of Seebeck effect in low-buckled Dirac materials (LBDMs), whose band structure are modulated by local application of a gate voltage and off-resonant circularly polarized light. We calculate the charge, spin and val...

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Bibliographic Details
Published in:arXiv.org 2017-09
Main Author: Mohammadi, Yawar
Format: Article
Language:English
Subjects:
Chemical potential
Circular polarization
Dependence
Electric fields
Electric potential
Luminous intensity
Mathematical analysis
Organic chemistry
Polarization (spin alignment)
Polarized light
Seebeck effect
Spin-orbit interactions
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Summary:Employing the Landauer-Buttiker formula we investigate the spin and valley dependence of Seebeck effect in low-buckled Dirac materials (LBDMs), whose band structure are modulated by local application of a gate voltage and off-resonant circularly polarized light. We calculate the charge, spin and valley Seebeck coefficients of an irradiated LBDM as functions of electronic doping, light intensity and the amount of the electric field in the linear regime. Our calculation reveal that all Seebeck coefficients always shows an odd features with respect to the chemical potential. Moreover, we show that, due to the strong spin-orbit coupling in the LBDMs, the induced thermovoltage in the irradiated LBDMs is spin polarized, and can also become valley polarized if the gate voltage is applied too. It is also found that the valley (spin) polarization of the induced thermovoltage could be inverted by reversing the circular polarization of light or reversing the direction the electric field (only by reversing the circular polarization of light).
ISSN:2331-8422
DOI:10.48550/arxiv.1709.10357