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arXiv · 2607.27641

Third-order nonlinear transport in a percolative two-dimensional superconductor

Wenjun Liu·Chenghe Wang·Xiubin Li·Kenji Watanabe·Takashi Taniguchi·Tao Zhang·Xiao-Xiao Zhang·Jing Li
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Abstract

Percolative superconductivity frequently arises in two-dimensional van der Waals materials due to reduced dimensionality, enhanced quantum fluctuations, and complex electron-phonon interactions, providing a unique platform where normal electrons coexist with Cooper pairs. We report the observation of substantial third-order nonlinear transport in a trilayer $1T^\prime$-MoTe$_2$ superconductor within its percolative transition regime. The third-harmonic longitudinal voltage ($V_{\|}^{3\omega}$) exhibits a clear cubic dependence on excitation current below a threshold, with both its magnitude and nonlinear coefficient strongly correlated with the superconducting state. This nonlinear response is semiquantitatively captured by the superconducting fluctuation within the time-dependent Ginzburg-Landau theory, where nonlinear transport arises due to fluctuating Cooper pairs. Our results demonstrate that third-order nonlinear transport serves as a sensitive probe of superconducting transitions in percolative systems and establish a foundation for exploring higher-order transport phenomena in strongly correlated systems.

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Wenjun Liu, Chenghe Wang, Xiubin Li, Kenji Watanabe, Takashi Taniguchi, Tao Zhang, Xiao-Xiao Zhang, Jing Li. 2026-07-30. Third-order nonlinear transport in a percolative two-dimensional superconductor. https://doi.org/10.1103/jcrm-953w

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