Dynamical effects of electron-hole correlation and giant quantum attenuation of ultrasound in semimetals

Y. Kuramoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The giant quantum attenuation of ultrasound in bismuth and other semimetals is noticeably enhanced when certain pair of Landau subbands of electrons and holes participate simultaneously in an attenuation peak. A theoretical analysis is presented which emphasizes importance of dynamical effects of the electron-hole correlation. In the temperature range between 1 K and 4 K covered by most experiments, the correlation effect is found to be weak on the real part of the relevant response function which gives changes in sound velocity. This implies that equilibrium properties of the system are not much influenced by the correlation effect. Nonetheless, the electron-hole correlation is shown to have a drastic consequence on the imaginary part of the response function probed by the ultrasonic attenuation. Proposal for experiment is advanced to discriminate relative importance of this exciton-like correlation from that of republsive correlation between carriers with the same charge.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalZeitschrift für Physik B Condensed Matter
Volume48
Issue number4
DOIs
Publication statusPublished - 1982 Dec

ASJC Scopus subject areas

  • Condensed Matter Physics

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