Effect of long-range 1/r interactions on the Landau damping in a Bose-Fermi mixture
Department of Physics, University of Isfahan, 81746, Isfahan, Iran
* e-mail: firstname.lastname@example.org
Revised: 24 February 2016
Accepted: 10 March 2016
Published online: 29 April 2016
By using the time-dependent mean-field approach based on the Popov approximation, the Landau damping in a Bose-Fermi superfluid mixture in the presence of a long-range interaction between bosons at finite temperature is studied. For a homogeneous three-dimension (3D) gas, we will show, since both Bose-Fermi and the interactions contributions are exponentially suppressed, the contact interaction has the dominant role to the low-temperature behavior of the Landau damping and the temperature behavior of the damping rate due to the and Bose-Fermi interactions similar to contact interaction is linear at high temperatures. In a two-dimension (2D) system, we will also show that the damping rate in a gas with the interaction has a minor role in comparison with contact and dipole-dipole interactions at all ranges of temperatures, and the low-temperatures behavior of the damping rate due to both the and dipole-dipole interactions scales as while the contact contribution changes as . Our results have important consequences for ongoing experiments and theoretical researches on ultracold gases with repulsive or attractive long-range interaction.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2016