Zero and first sound in normal fermi systems

Shohei Watabe, Aiko Osawa, Tetsuro Nikuni

研究成果: Article査読

12 被引用数 (Scopus)

抄録

On the basis of a moment method, general solutions of a linearized Boltzmann equation for a normal Fermi system are investigated. In particular, we study the sound velocities and damping rates as functions of the temperature and the coupling constant. In the extreme limits of collisionless and hydrodynamic regimes, eigenfrequency of sound mode obtained from the moment equations reproduces the well-known results of zero sound and first sound. In addition, the moment method can describe crossover between those extreme limits at finite temperatures. Solutions of the moment equations also involve a thermal diffusion mode. From solutions of these equations, we discuss excitation spectra corresponding to the particle-hole continuum as well as collective excitations. We also discuss a collective mode in a weak coupling case.

本文言語English
ページ(範囲)773-805
ページ数33
ジャーナルJournal of Low Temperature Physics
158
5-6
DOI
出版ステータスPublished - 2010 3月
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 材料科学(全般)
  • 凝縮系物理学

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