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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

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      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.

      Item type: Article
      ID code: 36981
      Keywords: Mechanical engineering and machinery, Mechanical Engineering, Computational Mechanics
      Subjects: Technology > Mechanical engineering and machinery
      Department: Faculty of Engineering > Mechanical and Aerospace Engineering
      Related URLs:
      Depositing user: Pure Administrator
      Date Deposited: 24 Jan 2012 09:37
      Last modified: 24 Jun 2014 04:04

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