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Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering
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en
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Physical Review Letters, Volume 120, issue 3, pp. 1-6
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.
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| openaire: EC/H2020/743884/EU//DiracEntangler
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Breunig, D, Burset, P & Trauzettel, B 2018, 'Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering', Physical Review Letters, vol. 120, no. 3, 037701, pp. 1-6. https://doi.org/10.1103/PhysRevLett.120.037701