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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Third-Order Nonlinear Transport in a Percolative Two-Dimensional Superconductor
Wenjun Liu1, Chenghe Wang1, Xiubin Li1
1Huazhong University of Science and Technology, Wuhan National High Magnetic Field Center and School of Physics, Hubei Fundamental Research Center for Physics, Hubei Key Laboratory of Gravitation and Quantum Physics, Wuhan 430074, China.
None:
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.
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