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Abstract
In superconducting spintronics, it is essential to generate spin-Triplet Cooper pairs on demand. Up to now, proposals to do so concentrate on hybrid structures in which a superconductor (SC) is combined with a magnetically ordered material (or an external magnetic field). We, instead, identify a novel way to create and isolate spin-Triplet Cooper pairs in the absence of any magnetic ordering. This achievement is only possible because we drive a system with strong spin-orbit interaction-the Dirac surface states of a strong topological insulator (TI)-out of equilibrium. In particular, we consider a bipolar TI-SC-TI junction, where the electrochemical potentials in the outer leads differ in their overall sign. As a result, we find that nonlocal singlet pairing across the junction is completely suppressed for any excitation energy. Hence, this junction acts as a perfect spin-Triplet filter across the SC, generating equal-spin Cooper pairs via crossed Andreev reflection.
Original language | English |
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Article number | 037701 |
Pages (from-to) | 1-6 |
Journal | Physical Review Letters |
Volume | 120 |
Issue number | 3 |
DOIs | |
Publication status | Published - 19 Jan 2018 |
MoE publication type | A1 Journal article-refereed |
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Dive into the research topics of 'Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering'. Together they form a unique fingerprint.Projects
- 1 Finished
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DIRACENTANGLER: Cooper pair splitter based on Dirac materials
Flindt, C. (Principal investigator)
01/04/2017 → 31/03/2019
Project: EU: Framework programmes funding