期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.227701
关键词
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资金
- CNR-CONICET cooperation program Energy conversion in quantum nanoscale hybrid devices
- CONICET [PIP-RD 20141216-4905]
- Alexander von Humboldt Foundation, Germany
- ICTP-Trieste
- Simons Foundation
- Quant-Era project Supertop
- Royal Society [IES R3 170054, IEC R2 192166]
- [PICT-2014-2049]
- [PICT-2017-2726]
We consider a Josephson junction hosting a Kramers pair of helical edge states of a quantum spin Hall bar in contact with a normal-metal probe. In this hybrid system, the orbital phase, induced by a small magnetic field threading the junction known as a Doppler shift, combines with the conventional Josephson phase difference and originates an effect akin to a Zeeman field in the spectrum. As a consequence, when a temperature bias is applied to the superconducting terminals, a thermoelectric current is established in the normal probe. We argue that this purely nonlocal thermoelectric effect is a unique signature of the helical nature of the edge states coupled to superconducting leads and it can constitute a useful tool for probing the helical nature of the edge states in systems where the Hall bar configuration is difficult to achieve. We fully characterize thermoelectric response and performance of this hybrid junction in a wide range of parameters, demonstrating that the external magnetic flux inducing the Doppler shift can be used as a knob to control the thermoelectric response and the heat flow in a novel device based on topological junctions.
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