固体~ 4 He零温动力学的量子蒙特卡罗模拟
Zero-temperature dynamics of solid 4He from quantum Monte Carlo simulations
摘要：
采用基态路径积分量子Monte Carlo方法，研究了零温下六方晶系~ 4 He在两种不同密度（近熔化和远熔化）下的晶格动力学.得到完整的声子色散，特别注意光学和声学分支的分离和横向模式的识别。我们的研究还揭示了影响准粒子激发的剩余相干性在中间动量区域，在声子和近自由粒子制度之间。
英文摘要：
The lattice dynamics of hcp crystalline 4He is studied at zero temperature and for two different densities (near and far from melting), using a ground-state path-integral quantum Monte Carlo technique. The complete phonon dispersion is obtained, with particular attention to the separation of optic and acoustic branches and to the identification of transverse modes. Our study also sheds light onto the residual coherence affecting quasiparticle excitations in the intermediate momentum region, in-between the phonon and nearly-free particle regimes.
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