Validation of the Ability of Full Configuration Interaction Quantum Monte Carlo for Studying the 2D Hubbard Model | |
Yun, Su-Jun1,3; Dong, Tie-Kuang2![]() | |
刊名 | CHINESE PHYSICS LETTERS
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2017-07-01 | |
卷号 | 34期号:8页码:5 |
ISSN号 | 0256-307X |
DOI | 10.1088/0256-307X/34/8/080201 |
英文摘要 | To validate the ability of full configuration interaction quantum Monte Carlo (FCIQMC) for studying the 2D Hubbard model near half-filling regime, the ground state energies of a 4 x 4 square lattice system with various interaction strengths are calculated. It is found that the calculated results are in good agreement with those obtained by exact diagonalization (i.e., the exact values for a given basis set) when the population of psi particles (psips) is higher than the critical population required to correctly sample the ground state wave function. In addition, the variations of the average computational time per 20 Monte Carlo cycles with the coupling strength and the number of processors are also analyzed. The calculated results show that the computational efficiency of an FCIQMC calculation is mainly affected by the total population of psips and the communication between processors. These results can provide useful references for understanding the FCIQMC algorithm, studying the ground state properties of the 2D Hubbard model for the larger system size by the FCIQMC method and using a computational budget as effectively as possible. |
WOS关键词 | RANDOM-WALK ; SIMULATIONS |
WOS研究方向 | Physics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000412909200001 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/22775] ![]() |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Yun, Su-Jun |
作者单位 | 1.Nanjing Xiaozhuang Univ, Sch Elect Engn, Nanjing 211171, Jiangsu, Peoples R China 2.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Yun, Su-Jun,Dong, Tie-Kuang,Zhu, Shi-Ning. Validation of the Ability of Full Configuration Interaction Quantum Monte Carlo for Studying the 2D Hubbard Model[J]. CHINESE PHYSICS LETTERS,2017,34(8):5. |
APA | Yun, Su-Jun,Dong, Tie-Kuang,&Zhu, Shi-Ning.(2017).Validation of the Ability of Full Configuration Interaction Quantum Monte Carlo for Studying the 2D Hubbard Model.CHINESE PHYSICS LETTERS,34(8),5. |
MLA | Yun, Su-Jun,et al."Validation of the Ability of Full Configuration Interaction Quantum Monte Carlo for Studying the 2D Hubbard Model".CHINESE PHYSICS LETTERS 34.8(2017):5. |
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