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<p>Based on the generalization of the Feynman relation for the energy of elementary excitations to finite temperatures and calculations of the static structure factor by the molecular dynamics method, excitation spectra for a single-component plasma are considered. The existence of a phonon–roton branch of elementary excitations is shown, and its dependence on the parameters of the Coulomb interaction and degeneracy is obtained. In the approach under consideration, a second roton minimum arises, associated with a strong Coulomb interaction. The universality of the generalized criterion allows it to be used for systems described by various interparticle potentials, including liquid metals.</p>

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Generalized Feynman Approach and Phonon–Roton Excitations for Coulomb Systems

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • S. A. Trigger

摘要

Based on the generalization of the Feynman relation for the energy of elementary excitations to finite temperatures and calculations of the static structure factor by the molecular dynamics method, excitation spectra for a single-component plasma are considered. The existence of a phonon–roton branch of elementary excitations is shown, and its dependence on the parameters of the Coulomb interaction and degeneracy is obtained. In the approach under consideration, a second roton minimum arises, associated with a strong Coulomb interaction. The universality of the generalized criterion allows it to be used for systems described by various interparticle potentials, including liquid metals.