Heat to work conversion in the quantum spin Hall effect

DIPC Seminars

Liliana Arrachea, Universidad Nacional de San Martín, Argentina
Donostia International Physics Center
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Heat to work conversion in the quantum spin Hall effect We study the thermoelectric properties of a Kramers pair of helical edge states of the quantum spin Hall effect coupled to a nanomagnet with a component of the magnetization perpendicular to the direction of the spin- orbit interaction of the host. We show that the transmission function of this structure has the desired qualities for optimal thermoelectric performance in the quantum coherent regime. For a single magnetic domain there is a power generation close to the optimal bound. In a configuration with two magnetic domains with different orientations, pronounced peaks in the transmission functions and resonances lead to a high figure of merit. We provide estimates for the fabrication of this device with HgTe quantum-well topological insulators. References: D. Gresta, M. Real and L. Arrachea Physical Review Letter 123,186801 (2019), P. Roura-Bas, L.Arrachea and E. Fradkin, Phys. Rev. B 98, 195429 (2018) Host: Nicolás Lorente