Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

Numerical investigation of the radial quadrupole and scissors modes in trapped gases

Wu, Lei and Zhang, Yonghao (2012) Numerical investigation of the radial quadrupole and scissors modes in trapped gases. EPL: A Letters Journal Exploring the Frontiers of Physics, 97. pp. 1-6. ISSN 0295-5075

[img] PDF
Zhang_YH_Pure_Numerical_investigation_of_the_radial_quadrupole_and_scissors_modes_in_trapped_gases_Jan_2012.pdf - Draft Version

Download (157kB)
[img] PDF
Zhang_YH_Numerical_investigation_of_the_radial_quadrupole_and_scissors_modes_in_trapped_gases_Jan_2012.pdf - Published Version

Download (356kB)

Abstract

The analytical expressions for the frequency and damping of the radial quadrupole and scissors modes, as obtained from the method of moments, are limited to the harmonic potential. In addition, the analytical results may not be suciently accurate as an average relaxation time is used and the high-order moments are ignored. Here, we propose to numerically solve the Boltzmann model equation in the hydrodynamic, transition, and collisionless regimes to study mode frequency and damping. When the gas is trapped by the harmonic potential, we nd that the analytical expressions underestimate the damping in the transition regime. In addition, we demonstrate that the numerical simulations are able to provide reasonable predictions for the collective oscillations in the Gaussian potentials.