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Finite Size Effect in Path Integral Monte Carlo Simulations of ~4He Systems

Finite Size Effect in Path Integral Monte Carlo Simulations of ~4He Systems
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摘要 Path integral Monte Carlo (PIMC) simulations are a powerful computational method to study interacting quantum systems at finite temperatures. In this work, PIMC has been applied to study the finite size effect of the simulated systems of ^4He. We determine the energy as a function of temperature at saturated-vapor-pressure (SVP) conditions in the temperature range of T ∈ [1.0 K,4.0 K], and the equation of state (EOS) in the grmmd state For systems consisted of 32, 64 and 128 ^4He atoms, respectively, We find that the energy at SVP is influenced significantly by the size of the simulated system in the temperature range of T ∈ [2.1 K, 3.0 K] and the larger the system is, the better results are obtained in comparison with the experimental values; while the EOS appeared to be unrelated to it.
出处 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第10期987-989,共3页 理论物理通讯(英文版)
基金 National Natural Science Foundation of China and the China Academy of Engineering Physics under Grant No.10676025(NSAF) the Scientific Research Foundation for the Returned Overseas Chinese Scholars,the Ministry of Education
关键词 path integral Monte Carlo simulation finite size effect HELIUM equation of state 路径 积分模拟 有限尺码作用 氦元素
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