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Auxiliary-field Monte Carlo method for frustrated spin systems |
Ning Cai(蔡凝)1, Yuan Gao(高源)2,3, Wei Li(李伟)3,4†, and Yang Qi(戚扬)1‡ |
1 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China; 2 School of Physics, Beihang University, Beijing 100191, China; 3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China; 4 Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing 100191, China |
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Abstract We extend a semiclassical numerical method, bosonic auxiliary-field Monte Carlo, to quantum spin systems. This method breaks the lattice into clusters, solves each cluster precisely and couples them with classical auxiliary fields through classical Monte Carlo simulation. We test the method with antiferromagnetic spin models in one-dimensional chains, square lattices and triangular lattices, and obtain reasonable results at finite temperatures. This algorithm builds a bridge between classical Monte Carlo method and quantum methods. The algorithm can be improved with either progress in classical Monte Carlo sampling or the development of quantum solvers, and can also be further applied to systems with different lattices or interactions.
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Received: 05 December 2024
Revised: 05 December 2024
Accepted manuscript online: 08 January 2025
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PACS:
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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87.55.K-
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(Monte Carlo methods)
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Fund: W.L. acknowledges supports by the National Key Research and Development Program of China (Grant No. 2024YFA1409200), the National Natural Science Foundation of China (Grant Nos. 12222412 and 12047503), and CAS Project for Young Scientists in Basic Research (Grant No. YSBR-057). Y.Q. acknowledges supports by the National Natural Science Foundation of China (Grant No. 12374144). |
Corresponding Authors:
Wei Li, Yang Qi
E-mail: w.li@itp.ac.cn;qiyang@fudan.edu.cn
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Cite this article:
Ning Cai(蔡凝), Yuan Gao(高源), Wei Li(李伟), and Yang Qi(戚扬) Auxiliary-field Monte Carlo method for frustrated spin systems 2025 Chin. Phys. B 34 027504
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