2026/07/08 by Anonymous, Wenjun Liu, Chenghe Wang +6
Physics and Astronomy · #Nonlinear Photonic Systems #Quantum and electron transport phenomena #Theoretical and Computational Physics #cond-mat.mes-hall #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/jcrm-953w
published as Phys. Rev. Lett. 137, 056201 (2026)
openalex publication_date 2026/07/08 · openalex created_date 2026/07/09 · arxiv created 2026/07/30 · arxiv updated 2026/07/31 · openalex updated_date 2026/07/31
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^′-MoTe2 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.