Thermoelectric detection of Andreev states in unconventional superconductors
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 superconducti...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-12-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043388 |
| _version_ | 1827285880706957312 |
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| author | Tony Savander Shun Tamura Christian Flindt Yukio Tanaka Pablo Burset |
| author_facet | Tony Savander Shun Tamura Christian Flindt Yukio Tanaka Pablo Burset |
| author_sort | Tony Savander |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T10:22:05Z |
| format | Article |
| id | doaj.art-da173ea34f8849bc8c08f556b3997d23 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:22:05Z |
| publishDate | 2020-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-da173ea34f8849bc8c08f556b3997d232024-04-12T17:05:26ZengAmerican Physical SocietyPhysical Review Research2643-15642020-12-012404338810.1103/PhysRevResearch.2.043388Thermoelectric detection of Andreev states in unconventional superconductorsTony SavanderShun TamuraChristian FlindtYukio TanakaPablo BursetWe 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.http://doi.org/10.1103/PhysRevResearch.2.043388 |
| spellingShingle | Tony Savander Shun Tamura Christian Flindt Yukio Tanaka Pablo Burset Thermoelectric detection of Andreev states in unconventional superconductors Physical Review Research |
| title | Thermoelectric detection of Andreev states in unconventional superconductors |
| title_full | Thermoelectric detection of Andreev states in unconventional superconductors |
| title_fullStr | Thermoelectric detection of Andreev states in unconventional superconductors |
| title_full_unstemmed | Thermoelectric detection of Andreev states in unconventional superconductors |
| title_short | Thermoelectric detection of Andreev states in unconventional superconductors |
| title_sort | thermoelectric detection of andreev states in unconventional superconductors |
| url | http://doi.org/10.1103/PhysRevResearch.2.043388 |
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