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• W4313448429 abstract "As an intrinsically unbiased method, the quantum Monte Carlo (QMC) method is of unique importance in simulating interacting quantum systems. Although the QMC method often suffers from the notorious sign problem, the sign problem of quantum models may be mitigated by finding better choices of the simulation scheme. However, a general framework for identifying optimal QMC schemes has been lacking. Here, we propose a general framework using automatic differentiation to automatically search for the best QMC scheme within a given ansatz of the Hubbard-Stratonovich transformation, which we call automatic differentiable sign optimization (ADSO). We apply the ADSO framework to the honeycomb lattice Hubbard model with Rashba spin-orbit coupling and demonstrate that ADSO is remarkably effective in mitigating and even solving its sign problem. Specifically, ADSO finds a sign-free point in the model which was previously thought to be sign-problematic. For the sign-free model discovered by ADSO, its ground state is shown by sign-free QMC simulations to possess spiral magnetic ordering; we also obtained the critical exponents characterizing the magnetic quantum phase transition." @default.
• W4313448429 created "2023-01-06" @default.
• W4313448429 creator A5008810579 @default.
• W4313448429 creator A5009852458 @default.
• W4313448429 creator A5047215804 @default.
• W4313448429 date "2022-12-20" @default.
• W4313448429 modified "2023-10-16" @default.
• W4313448429 title "Mitigating the fermion sign problem by automatic differentiation" @default.
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