Finite-temperature signatures of underlying superconductivity in the electron-doped Hubbard model

Wen O. Wang; Thomas P. Devereaux

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arXiv · 2510.16616

Finite-temperature signatures of underlying superconductivity in the electron-doped Hubbard model

Wen O. Wang·Thomas P. Devereaux

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Abstract

We perform numerically exact determinant quantum Monte Carlo simulations of the Hubbard model and analyze pairing tendencies by evaluating correlation functions at the imaginary-time midpoint ($\tau=\beta/2$), which suppresses high-frequency weight and emphasizes low-energy physics. Using this diagnostic, we identify clear finite-temperature signatures of underlying $d$-wave superconductivity for electron doping, while finding no clear indication upon cooling for hole doping. Our analysis enables direct comparison with ground-state DMRG, revealing consistent real-space pairing patterns. These results provide a practical route to bridge the gap between finite-temperature and ground-state numerically exact simulations of the Hubbard model despite the fermion sign problem.

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Wen O. Wang, Thomas P. Devereaux. 2025-10-18. Finite-temperature signatures of underlying superconductivity in the electron-doped Hubbard model. https://arxiv.org/abs/2510.16616

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