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Linear response of one-dimensional liquid $^4$He to external perturbations

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arxiv 1607.05301 v2 pith:UBAH4GHN submitted 2016-07-18 cond-mat.other

M. Motta , G. Bertaina , E. Vitali , D.E. Galli , M. Rossi This is my paper
classification cond-mat.other
keywords responseliquidone-dimensionalperturbationsab-initioalongdensitydescribing
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abstract

We study the response of one-dimensional liquid $^4$He to weak perturbations relying on the dynamical structure factor, $S(q,\omega)$, recently obtained via ab-initio techniques [Phys. Rev. Lett. 116, 135302 (2016)]. We evaluate the drag force, $F_v$, experienced by an impurity moving along the system with velocity $v$ and the static response function, $\chi(q)$, describing the density modulations induced by a periodic perturbation with wave vector $q$.

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