Thermoelectric effects in quantum Hall systems beyond linear response

We consider a quantum Hall system with an antidot acting as a energy dependent scatterer. In the purely charge case, we find deviations from the Wiedemann-Franz law that take place in the nonlinear regime of transport. We also discuss Peltier effects beyond linear response and describe both effects...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-12, Vol.568 (5), p.52016
Main Authors: López, Rosa, Hwang, Sun-Yong, Sánchez, David
Format: Article
Language:English
Subjects:
Antidots
Ferromagnetism
Lorenz number
Peltier effects
Physics
Quantum Hall effect
Spintronics
Topological insulators
Transport properties
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Summary:We consider a quantum Hall system with an antidot acting as a energy dependent scatterer. In the purely charge case, we find deviations from the Wiedemann-Franz law that take place in the nonlinear regime of transport. We also discuss Peltier effects beyond linear response and describe both effects using magnetic-field asymmetric transport coefficients. For the spin case such as that arising along the helical edge states of a two-dimensional topological insulator, we investigate the generation of spin currents as a result of applied voltage and temperature differences in samples attached to ferromagnetic leads. We find that in the parallel configuration the spin current can be tuned with the leads' polarization even in the linear regime of transport. In contrast, for antiparallel magnetizations the spin currents has a strict nonlinear dependence on the the applied fields.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/568/5/052016