Multiorbital singlet pairing and d + d superconductivity

Abstract Recent experiments in multiband Fe-based and heavy-fermion superconductors have challenged the long-held dichotomy between simple s- and d-wave spin-singlet pairing states. Here, we advance several time-reversal-invariant irreducible pairings that go beyond the standard singlet functions th...

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Autores principales:	Emilian M. Nica, Qimiao Si
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/8a2738e3b0274cd3b00e4f2c537f26fa
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spelling	oai:doaj.org-article:8a2738e3b0274cd3b00e4f2c537f26fa2021-12-02T14:24:00ZMultiorbital singlet pairing and d + d superconductivity10.1038/s41535-020-00304-32397-4648https://doaj.org/article/8a2738e3b0274cd3b00e4f2c537f26fa2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00304-3https://doaj.org/toc/2397-4648Abstract Recent experiments in multiband Fe-based and heavy-fermion superconductors have challenged the long-held dichotomy between simple s- and d-wave spin-singlet pairing states. Here, we advance several time-reversal-invariant irreducible pairings that go beyond the standard singlet functions through a matrix structure in the band/orbital space, and elucidate their naturalness in multiband systems. We consider the s τ 3 multiorbital superconducting state for Fe-chalcogenide superconductors. This state, corresponding to a d + d intra- and inter-band pairing, is shown to contrast with the more familiar d + id state in a way analogous to how the B- triplet pairing phase of 3He superfluid differs from its A- phase counterpart. In addition, we construct an analog of the s τ 3 pairing for the heavy-fermion superconductor CeCu2Si2, using degrees-of-freedom that incorporate spin-orbit coupling. Our results lead to the proposition that d-wave superconductors in correlated multiband systems will generically have a fully-gapped Fermi surface when they are examined at sufficiently low energies.Emilian M. NicaQimiao SiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Emilian M. Nica Qimiao Si Multiorbital singlet pairing and d + d superconductivity
description	Abstract Recent experiments in multiband Fe-based and heavy-fermion superconductors have challenged the long-held dichotomy between simple s- and d-wave spin-singlet pairing states. Here, we advance several time-reversal-invariant irreducible pairings that go beyond the standard singlet functions through a matrix structure in the band/orbital space, and elucidate their naturalness in multiband systems. We consider the s τ 3 multiorbital superconducting state for Fe-chalcogenide superconductors. This state, corresponding to a d + d intra- and inter-band pairing, is shown to contrast with the more familiar d + id state in a way analogous to how the B- triplet pairing phase of 3He superfluid differs from its A- phase counterpart. In addition, we construct an analog of the s τ 3 pairing for the heavy-fermion superconductor CeCu2Si2, using degrees-of-freedom that incorporate spin-orbit coupling. Our results lead to the proposition that d-wave superconductors in correlated multiband systems will generically have a fully-gapped Fermi surface when they are examined at sufficiently low energies.
format	article
author	Emilian M. Nica Qimiao Si
author_facet	Emilian M. Nica Qimiao Si
author_sort	Emilian M. Nica
title	Multiorbital singlet pairing and d + d superconductivity
title_short	Multiorbital singlet pairing and d + d superconductivity
title_full	Multiorbital singlet pairing and d + d superconductivity
title_fullStr	Multiorbital singlet pairing and d + d superconductivity
title_full_unstemmed	Multiorbital singlet pairing and d + d superconductivity
title_sort	multiorbital singlet pairing and d + d superconductivity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8a2738e3b0274cd3b00e4f2c537f26fa
work_keys_str_mv	AT emilianmnica multiorbitalsingletpairingandddsuperconductivity AT qimiaosi multiorbitalsingletpairingandddsuperconductivity
_version_	1718391437794476032

Multiorbital singlet pairing and d + d superconductivity

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