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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Online Access: | https://arxiv.org/abs/2409.08972 |
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| _version_ | 1866915299312271360 |
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| author | Mukasa, Kohei Masaki, Yusuke |
| author_facet | Mukasa, Kohei Masaki, Yusuke |
| contents | We theoretically study finite-momentum superconductivity in two-dimensional (2D) altermagnets with a Rashba-type spin-orbit coupling (RSOC). We show the phase diagrams obtained by solving a linearized gap equation, considering two directions of the Néel vector of the 2D altermagnet: parallel to the $xy$ plane (in-plane) and perpendicular to the $xy$ plane (out-of-plane). For the in-plane Néel vector, we find two different finite-momentum $d_{x^2-y^2}$-wave superconducting states distinguished by a dominant pairing channel: an inter-band pairing or an intra-band pairing. Furthermore, it is shown that an anisotropic deformation of Fermi surfaces caused by spin-splitting effects due to the in-plane Néel vector and the RSOC can contribute to the stabilization of the finite-momentum superconductivity. We also perform the self-consistent calculations, and verify the existence of these superconducting states in addition to identifying other possible superconducting states and transition lines away from the phase boundary. For the out-of-plane Néel vector, the finite-momentum superconductivity is realized only in the inter-band pairing mechanism, which is in contrast to the in-plane case. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_08972 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Finite-momentum superconductivity in two-dimensional altermagnets with a Rashba-type spin-orbit coupling Mukasa, Kohei Masaki, Yusuke Superconductivity We theoretically study finite-momentum superconductivity in two-dimensional (2D) altermagnets with a Rashba-type spin-orbit coupling (RSOC). We show the phase diagrams obtained by solving a linearized gap equation, considering two directions of the Néel vector of the 2D altermagnet: parallel to the $xy$ plane (in-plane) and perpendicular to the $xy$ plane (out-of-plane). For the in-plane Néel vector, we find two different finite-momentum $d_{x^2-y^2}$-wave superconducting states distinguished by a dominant pairing channel: an inter-band pairing or an intra-band pairing. Furthermore, it is shown that an anisotropic deformation of Fermi surfaces caused by spin-splitting effects due to the in-plane Néel vector and the RSOC can contribute to the stabilization of the finite-momentum superconductivity. We also perform the self-consistent calculations, and verify the existence of these superconducting states in addition to identifying other possible superconducting states and transition lines away from the phase boundary. For the out-of-plane Néel vector, the finite-momentum superconductivity is realized only in the inter-band pairing mechanism, which is in contrast to the in-plane case. |
| title | Finite-momentum superconductivity in two-dimensional altermagnets with a Rashba-type spin-orbit coupling |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2409.08972 |