Heat to work conversion in the quantum spin Hall effect
DIPC Seminars
- Speaker
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Liliana Arrachea, Universidad Nacional de San Martín, Argentina
- When
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2019/12/10
13:00 - Place
- Donostia International Physics Center
- Add to calendar
-
iCal
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