Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911714313764864 |
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| author | Tajima, Hiroyuki Sekino, Yuta Funaki, Hiroshi Kisaka, Shota Yasutake, Nobutoshi Matsuo, Mamoru |
| author_facet | Tajima, Hiroyuki Sekino, Yuta Funaki, Hiroshi Kisaka, Shota Yasutake, Nobutoshi Matsuo, Mamoru |
| contents | We discuss anomalous spin polarization on the surface of nuclear pasta in a neutron star, driven by a nuclear spin-orbit interaction. We present an effective two-band model of surface-localized neutrons near the nuclear pasta. The central point is the emergence of a Rashba-type spin-orbit hybridization generated by the neutron--nucleus spin-orbit force in the presence of the strong density gradient normal to the pasta surface. Starting from a single-particle Hamiltonian with a central potential and a standard nuclear spin-orbit interaction, we show that the surface spin polarization occurs due to the thermal inhomogeneity even in the absence of a magnetic field. Our study links neutron-star physics and solid-state spintronics and would contribute to understanding the interplay between spin dynamics and strong magnetic fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_25067 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta Tajima, Hiroyuki Sekino, Yuta Funaki, Hiroshi Kisaka, Shota Yasutake, Nobutoshi Matsuo, Mamoru Nuclear Theory High Energy Astrophysical Phenomena Mesoscale and Nanoscale Physics Quantum Gases Strongly Correlated Electrons We discuss anomalous spin polarization on the surface of nuclear pasta in a neutron star, driven by a nuclear spin-orbit interaction. We present an effective two-band model of surface-localized neutrons near the nuclear pasta. The central point is the emergence of a Rashba-type spin-orbit hybridization generated by the neutron--nucleus spin-orbit force in the presence of the strong density gradient normal to the pasta surface. Starting from a single-particle Hamiltonian with a central potential and a standard nuclear spin-orbit interaction, we show that the surface spin polarization occurs due to the thermal inhomogeneity even in the absence of a magnetic field. Our study links neutron-star physics and solid-state spintronics and would contribute to understanding the interplay between spin dynamics and strong magnetic fields. |
| title | Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta |
| topic | Nuclear Theory High Energy Astrophysical Phenomena Mesoscale and Nanoscale Physics Quantum Gases Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.25067 |