Third-Order Nonlinear Transport in a Percolative Two-Dimensional Superconductor.

Authors

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

Published in

Physical review letters. Volume 137. Issue 5. Pages 056201. Jul 31, 2026.

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^{'}-MoTe_{2} superconductor within its percolative transition regime. The third-harmonic longitudinal voltage (V_{∥}^{3ω}) 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.

PMID:
42606493
Bibliographic data and abstract were imported from PubMed on 17 Aug 2026.

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