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<p>In low-dimensional superconductors, the interplay between quantum confinement and interfacial hybridization effects can reshape Cooper-pair wavefunctions and give rise to unconventional superconducting states. Here we use plasma-free confinement epitaxy assisted by a carbon buffer layer to synthesize a gallium trilayer sandwiched between graphene and a 6H-SiC(0001) substrate. Within this confined gallium layer, we demonstrate interfacial Ising-type superconductivity driven by atomic orbital hybridization. Electrical transport measurements reveal that the in-plane upper critical magnetic field reaches ~21.98 T at <i>T</i> = 400 mK, approximately 3.38 times the Pauli paramagnetic limit. Angle-resolved photoemission spectroscopy measurements, combined with theoretical calculations, confirm the presence of split Fermi surfaces with Ising-type spin textures at the K and K′ valleys of the confined gallium layer, originating from strong hybridization with the SiC substrate. This work establishes a strategy for realizing unconventional pairing wavefunctions through the synergistic combination of quantum confinement and interfacial hybridization effects.</p>

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Orbital-hybridization-induced Ising-type superconductivity in a confined gallium layer

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Hemian Yi,
  • Yunzhe Liu,
  • Chengye Dong,
  • Yiheng Yang,
  • Zi-Jie Yan,
  • Zihao Wang,
  • Lingjie Zhou,
  • Dingsong Wu,
  • Houke Chen,
  • Stephen Paolini,
  • Bing Xia,
  • Bomin Zhang,
  • Xiaoda Liu,
  • Hongtao Rong,
  • Annie G. Wang,
  • Saswata Mandal,
  • Kaijie Yang,
  • Benjamin N. Katz,
  • Lunhui Hu,
  • Jieyi Liu,
  • Tien-Lin Lee,
  • Vincent H. Crespi,
  • Yuanxi Wang,
  • Yulin Chen,
  • Joshua A. Robinson,
  • Chao-Xing Liu,
  • Cui-Zu Chang

摘要

In low-dimensional superconductors, the interplay between quantum confinement and interfacial hybridization effects can reshape Cooper-pair wavefunctions and give rise to unconventional superconducting states. Here we use plasma-free confinement epitaxy assisted by a carbon buffer layer to synthesize a gallium trilayer sandwiched between graphene and a 6H-SiC(0001) substrate. Within this confined gallium layer, we demonstrate interfacial Ising-type superconductivity driven by atomic orbital hybridization. Electrical transport measurements reveal that the in-plane upper critical magnetic field reaches ~21.98 T at T = 400 mK, approximately 3.38 times the Pauli paramagnetic limit. Angle-resolved photoemission spectroscopy measurements, combined with theoretical calculations, confirm the presence of split Fermi surfaces with Ising-type spin textures at the K and K′ valleys of the confined gallium layer, originating from strong hybridization with the SiC substrate. This work establishes a strategy for realizing unconventional pairing wavefunctions through the synergistic combination of quantum confinement and interfacial hybridization effects.