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arXiv · 2509.18781

Signature of chiral superconducting order parameter evidenced in mesoscopic superconductors

Xiaoying Xu·Wei Qin·Yuelin Shen·Zixuan Huang·Zhuoya Zhou·Zirao Wang·Yufan Li
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Abstract

Chiral superconductivity is a novel superconducting phase characterized by order parameters that break the time-reversal symmetry, endowing the state with a definite handedness. Unlike conventional superconductors, the Cooper pairs in a chiral superconductor carry nonzero orbital angular momentum. Through coupling with an external magnetic field, the finite angular momentum of the Cooper pair modulates the temperature-magnetic field phase boundary in a distinctive way, which could serve as an experimental signature of the chiral superconducting state. Here we demonstrate that the chiral signature can be detected in mesoscopic superconducting rings of $\beta$-Bi$_2$Pd, manifesting as a linear-in-field modulation of the critical temperature in the Little-Parks effect. Our findings establish a new experimental method for detecting the chiral superconductivity.

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Xiaoying Xu, Wei Qin, Yuelin Shen, Zixuan Huang, Zhuoya Zhou, Zirao Wang, Yufan Li. 2025-09-23. Signature of chiral superconducting order parameter evidenced in mesoscopic superconductors. https://doi.org/10.1103/qv9w-x78v

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