Excitation of Density Waves in a Condensed Boson System

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概要

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• By the use of the generalized Thomas-Fermi method a dispersion relation for the density waves in a condensed boson system is derived. Then a discussion is given of a critical phenomenon involving the excitation of these waves by particles injected with a given velocity (ν) into the system. It is shown that, provided the imaginary part of a certain admittance constant is very small, a critical velocity (ν_c) can be defined in the same way as was discussed first by Landau ; above this value of velocity the system exerts a strong resistive force (F) on the injected particles. It is also shown that, for 0<x=(ν-ν_c)/ν_c≪1, F is proportional to √<x>, if the Landau spectrum is used for the density waves ; and it is proportional to x in the plane wave approximation.

• 理論物理学刊行会の論文
• 1964-03-25

著者

• Takimoto Noboru

  Applied Mathematics Department University Of New South Wales : The Research Institute For Iron Steel

• TAKIMOTO Noboru

  Applied Mathematics Department, University of New South Wales : the Research Institute for Iron, Steel and Other Metals, Tohoku University

関連論文

• Excitation of Density Waves in a Condensed Boson System

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