Nature materials · 2026
Orbital-hybridization-induced Ising-type superconductivity in a confined gallium layer.
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Yi Hemian, Liu Yunzhe, Dong Chengye, Yang Yiheng, Yan Zi-Jie, Wang Zihao, Zhou Lingjie, Wu Dingsong, Chen Houke, Paolini Stephen, Xia Bing, Zhang Bomin, Liu Xiaoda, Rong Hongtao, Wang Annie G, Mandal Saswata, Yang Kaijie, Katz Benjamin N, Hu Lunhui, Liu Jieyi, Lee Tien-Lin, Crespi Vincent H, Wang Yuanxi, Chen Yulin, Robinson Joshua A, Liu Chao-Xing, Chang Cui-Zu
Аннотация
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.