Open AccessLandau damping and frequency-shift of monopole mode in an elongated-rubidium Bose-Einstein condensate
Author(s) -
Zhao-Liang Chai,
Yu Zhou,
Xuekai Ma
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.130307
Subject(s) - physics , landau damping , bose–einstein condensate , magnetic monopole , quantum electrodynamics , rubidium , mode (computer interface) , landau quantization , excited state , quantum mechanics , condensed matter physics , plasma , magnetic field , potassium , computer science , operating system , chemistry , organic chemistry
The Landau damping and frequency-shift of monopole mode in an elongated-rubidium Bose-Einstein condensate are investigated by using the time-dependent Hartree-Fock-Bogoliubov approximation. Improving the previous approach, We have taken into account the practical relaxations of elementary excitations and the orthogonal relation among them. With such an approach, we provide a new calculation formula for Landau damping rate and frequency-shift. In addition, our previous method of eliminating the divergence in three-mode coupling matrix elements is also improved by zeroing the kinetic energy at the condensate boundary instead of minimizing the ground-state energy. Based on these improvements, both the Landau damping rate and the frequency-shift of the monopole mode are analytically calculated and their temperature dependences are also discussed. And all the theoretical results are in agree meat with experimental data.