Low Temperature Physics: 37, 782 (2011); https://doi.org/10.1063/1.3665869 (3 pages)
Физика Низких Температур: Том 37, Выпуск 9-10 (Сентябрь 2011), c. 982-984    ( к оглавлению , назад )

Collective modes in quantum Fermi liquid

Nodar L. Tsintsadze and Levan N. Tsintsadze

E. Andronikashvili Institute of Physics, Tbilisi State University, Tbilisi, Georgia
E-mail: nltsin@yahoo.com

Received February 23, 2011


Landau’s theory of Fermi liquids is generalized by incorporating the de Broglie waves diffraction. A newly derived kinetic equation of the Fermi particles is used to derive a general dispersion relation and the excitation of zero sound is studied. A new mode is found due to the quantum correction. It is shown that the zero sound can exist even in an ideal Fermi gas. We also disclose a new branch of frequency spectrum due to the weak interaction.

PACS: 67.30.–n 3He;
PACS: 67.30.Em Excitations;
PACS: 03.75.Ss Degenerate Fermi gases.

Key words: Fermi liquid, excitation, quasiparticles, de Broglie waves.