Theory of Sound Wave and Phason in a Quasi One-Dimensional Incommensurate CDW System I. : Long-Range Coulnmb Effect

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概要

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• A microscopic theory of phason and sound wave is developed in a quasi onedimensional incommensulate CDW system within RPA. We prove a sum ruleat finite temperatures, which means that a sum of screening due to the phasonand that due to the quasiparticle excitations gives the same screening effect asthat in a normal state. It leads to the same velocity of the sound wave as that in anormal state. Effects of quasi-particle screening on the dispersion of the phasonare examined. As a consequence a singular behaviour is shown to result fromvelocities of thermally excited quasi-particles being too small to screen the in-duced charge of the phason near 0 K. The acoustic mode exists only above across-over temperature T. besides an optic mode corresponding to the Goldstonemode which exists below T.. This feature is similar to a superconductor in whichthe existence of the acoustic mode is well established both theoretically and ex-perimentally.

• 社団法人日本物理学会の論文
• 1985-03-15

著者

• NAKANE Yoshinori

  Institute of Physics,University of Tsukuba

• Takada Satoshi

  Institute Of Physics University Of Tsukuba

• Nakane Y

  Univ. Tsukuba Ibaraki Jpn

• Nakane Yoshinori

  Institute Of Physics University Of Tsukuba

• Takada Satoshi

  Institute For Solid States Physics University Of Tokyo : Department Of Physics College Of General Education University Of Tokyo

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