Projects per year
Abstract
We theoretically describe a thermoelectric effect that is entirely due to Andreev processes involving the formation of Cooper pairs through the coupling of electrons and holes. The Andreev thermoelectric effect can occur in ballistic ferromagnet-superconductor junctions with a dominant superconducting proximity effect on the ferromagnet, and it is very sensitive to surface states emerging in unconventional superconductors. We consider hybrid junctions in two and three dimensions to demonstrate that the thermoelectric current is always reversed in the presence of low-energy Andreev bound states at the superconductor surface. A microscopic analysis of the proximity-induced pairing reveals that the thermoelectric effect only arises if even- and odd-frequency Cooper pairs coexist in mixed singlet and triplet states. Our results are an example of the richness of emergent phenomena in systems that combine magnetism and superconductivity, and they open a pathway for exploring exotic surface states in unconventional superconductors.
Original language | English |
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Article number | 043388 |
Number of pages | 17 |
Journal | PHYSICAL REVIEW RESEARCH |
Volume | 2 |
Issue number | 4 |
DOIs | |
Publication status | Published - 18 Dec 2020 |
MoE publication type | A1 Journal article-refereed |
Keywords
- TUNNELING SPECTROSCOPY
- PAIRING SYMMETRY
- QUASI-PARTICLES
- SURFACE-STATES
- BOUND-STATES
- SPIN
- SUPERCURRENTS
- IMBALANCE
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Dive into the research topics of 'Thermoelectric detection of Andreev states in unconventional superconductors'. Together they form a unique fingerprint.Projects
- 2 Finished
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Finnish Centre of Excellence in Quantum Technology
Flindt, C., Potanina, E., Burset Atienza, P. & Pyhäranta, T.
01/01/2018 → 31/12/2020
Project: Academy of Finland: Other research funding
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Quantum Engineering of Charge, Heat, and Entropy Production in Nano-Devices
Flindt, C., Deger, A., Potanina, E., Norrman Brange, F., Roussel, B., Vecsei, P., Menczel, P. & Pyhäranta, T.
01/09/2017 → 31/12/2021
Project: Academy of Finland: Other research funding