Simulation of ring-exchange models with projected entangled pair states
Simulation of ring-exchange models with projected entangled pair states
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具有投影纠缠对态的环交换模型的模拟
DOI:
10.1103/physrevb.105.024417
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发表时间:
2021-08
期刊:
影响因子:
--
通讯作者:
Lixin He
中科院分区:
文献类型:
--
作者:
Chao Wang;Shaojun Dong;Yongjian Han;Lixin He
Algorithms to simulate the ring-exchange models using the projected entangled pair states (PEPS) are developed. We generalize the imaginary time evolution (ITE) method to optimize PEPS wave functions for the models with ring-exchange interactions. We compare the effects of different approximations to the environment. To understand the numerical instability during the optimization, we introduce the “singularity” of a PEPS and develop a regulation procedure that can effectively reduce the singularity of a PEPS. We benchmark our method with the toric code model, and obtain extremely accurate ground state energies and topological entanglement entropy. We also benchmark our method with the two-dimensional cyclic ring exchange model, and find that the ground state has a strong vector chiral order. The algorithms can be a powerful tool to investigate the models with ring interactions. The methods developed in this work, e.g., the regularization process to reduce the singularity can also be applied to other models.
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DOI:
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发表时间:
1958
期刊:
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影响因子:
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影响因子:
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DOI:
10.1201/9781315219707-33
发表时间:
2018-06
期刊:
Numerical Methods in Physics with Python
影响因子:
--
作者:
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通讯作者:
P. Joyce