Uniaxial spin texture in a superconducting electron gas revealed by exchange interactions

Junyi Yang; Changjiang Liu; Xianjing Zhou; Hanyu Hou; Kaijun Yin; Jianguo Wen; John Pearson; Alexey Suslov; Dafei Jin; Jidong S. Jiang; Ulrich Welp; Jian Min Zuo; Michael R. Norman; Anand Bhattacharya

doi:10.1126/sciadv.aeb1601

Uniaxial spin texture in a superconducting electron gas revealed by exchange interactions

Junyi Yang
, Changjiang Liu
, Xianjing Zhou
, Hanyu Hou
, Kaijun Yin
, Jianguo Wen
, John Pearson
, Alexey Suslov
, Dafei Jin
, Jidong S. Jiang
, Ulrich Welp
, Jian Min Zuo
, Michael R. Norman
, Anand Bhattacharya

Physics

Argonne National Laboratory
National High Magnetic Field Laboratory
Florida State University
University of Illinois at Urbana-Champaign
University of Notre Dame

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Two-dimensional (2D) superconductors with spin-textured Fermi surfaces can be a platform for realizing unconventional pairing states and are of substantial interest in the context of quantum information science and superconducting spintronics/orbitronics. We observed an unusual in-plane uniaxial anisotropy in the superconducting 2D electron gas (2DEG) formed at EuO_x/KTaO₃ (110) interfaces. This anisotropy is not evident in AlO_x/KTaO₃ (110) where the overlayer is nonmagnetic. Our results are consistent with a highly anisotropic “half-Rashba” spin-textured Fermi surface in 2DEGs formed at the KTaO₃ (110) interface that is hidden from external magnetic fields due to a near cancellation between orbital and spin moments but revealed by exchange interactions of the electrons in the 2DEG with Eu moments near the EuO_x/KTaO₃ (110) interface. The interactions between the uniaxial spin texture and the magnetic overlayer offer previously unexplored ways to explore the interplay between magnetism and 2D superconductivity.

Original language	English
Article number	eaeb1601
Pages (from-to)	1-9
Number of pages	9
Journal	Science Advances
Volume	12
Issue number	19
DOIs	https://doi.org/10.1126/sciadv.aeb1601
State	Published - 2026

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title = "Uniaxial spin texture in a superconducting electron gas revealed by exchange interactions",

abstract = "Two-dimensional (2D) superconductors with spin-textured Fermi surfaces can be a platform for realizing unconventional pairing states and are of substantial interest in the context of quantum information science and superconducting spintronics/orbitronics. We observed an unusual in-plane uniaxial anisotropy in the superconducting 2D electron gas (2DEG) formed at EuOx/KTaO3 (110) interfaces. This anisotropy is not evident in AlOx/KTaO3 (110) where the overlayer is nonmagnetic. Our results are consistent with a highly anisotropic {\textquotedblleft}half-Rashba{\textquotedblright} spin-textured Fermi surface in 2DEGs formed at the KTaO3 (110) interface that is hidden from external magnetic fields due to a near cancellation between orbital and spin moments but revealed by exchange interactions of the electrons in the 2DEG with Eu moments near the EuOx/KTaO3 (110) interface. The interactions between the uniaxial spin texture and the magnetic overlayer offer previously unexplored ways to explore the interplay between magnetism and 2D superconductivity.",

author = "Junyi Yang and Changjiang Liu and Xianjing Zhou and Hanyu Hou and Kaijun Yin and Jianguo Wen and John Pearson and Alexey Suslov and Dafei Jin and Jiang, \{Jidong S.\} and Ulrich Welp and Zuo, \{Jian Min\} and Norman, \{Michael R.\} and Anand Bhattacharya",

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year = "2026",

doi = "10.1126/sciadv.aeb1601",

language = "English",

volume = "12",

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journal = "Science Advances",

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AU - Yang, Junyi

AU - Liu, Changjiang

AU - Zhou, Xianjing

AU - Hou, Hanyu

AU - Yin, Kaijun

AU - Wen, Jianguo

AU - Pearson, John

AU - Suslov, Alexey

AU - Jin, Dafei

AU - Jiang, Jidong S.

AU - Welp, Ulrich

AU - Zuo, Jian Min

AU - Norman, Michael R.

AU - Bhattacharya, Anand

PY - 2026

Y1 - 2026

N2 - Two-dimensional (2D) superconductors with spin-textured Fermi surfaces can be a platform for realizing unconventional pairing states and are of substantial interest in the context of quantum information science and superconducting spintronics/orbitronics. We observed an unusual in-plane uniaxial anisotropy in the superconducting 2D electron gas (2DEG) formed at EuOx/KTaO3 (110) interfaces. This anisotropy is not evident in AlOx/KTaO3 (110) where the overlayer is nonmagnetic. Our results are consistent with a highly anisotropic “half-Rashba” spin-textured Fermi surface in 2DEGs formed at the KTaO3 (110) interface that is hidden from external magnetic fields due to a near cancellation between orbital and spin moments but revealed by exchange interactions of the electrons in the 2DEG with Eu moments near the EuOx/KTaO3 (110) interface. The interactions between the uniaxial spin texture and the magnetic overlayer offer previously unexplored ways to explore the interplay between magnetism and 2D superconductivity.

AB - Two-dimensional (2D) superconductors with spin-textured Fermi surfaces can be a platform for realizing unconventional pairing states and are of substantial interest in the context of quantum information science and superconducting spintronics/orbitronics. We observed an unusual in-plane uniaxial anisotropy in the superconducting 2D electron gas (2DEG) formed at EuOx/KTaO3 (110) interfaces. This anisotropy is not evident in AlOx/KTaO3 (110) where the overlayer is nonmagnetic. Our results are consistent with a highly anisotropic “half-Rashba” spin-textured Fermi surface in 2DEGs formed at the KTaO3 (110) interface that is hidden from external magnetic fields due to a near cancellation between orbital and spin moments but revealed by exchange interactions of the electrons in the 2DEG with Eu moments near the EuOx/KTaO3 (110) interface. The interactions between the uniaxial spin texture and the magnetic overlayer offer previously unexplored ways to explore the interplay between magnetism and 2D superconductivity.

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DO - 10.1126/sciadv.aeb1601

M3 - Article

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AN - SCOPUS:105038473602

SN - 2375-2548

VL - 12

SP - 1

EP - 9

JO - Science Advances

JF - Science Advances

IS - 19

M1 - eaeb1601

ER -

Uniaxial spin texture in a superconducting electron gas revealed by exchange interactions

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