Sound velocity and multibranch bogoliubov spectrum of an elongated fermi superfluid in the BEC-BCS crossover
Sound velocity and multibranch bogoliubov spectrum of an elongated fermi superfluid in the BEC-BCS crossover
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DOI：
10.1103/physreva.73.013613
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发表时间：
2005-10
影响因子：
2.9
通讯作者：
T. Ghosh;K. Machida
中科院分区：
文献类型：
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作者：
T. Ghosh;K. Machida
T的工作。K. Ghosh和K.町田[Phys.Rev.A73，013613（2006）和cond-mat/0510160]关于服从幂律状态方程的圆柱形限制费米超流体中的声速被证明利用了声波方程的不适当投影。这种不准确性完全解释了他们的结果与Capuzzi等人先前报告的结果之间的差异[Phys. Rev. A 73，021603（R）（2006）和cond-mat/0509323]。在这篇评论中，我们表明，当在投影中使用正确的权重函数时，这两种方法会导致完全相同的结果。还显示了在BCS和么正极限以及BEC区域中声子和单极模谱的正确行为的曲线图。
The work by T. K. Ghosh and K. Machida [Phys. Rev. A 73, 013613 (2006) and cond-mat/0510160] on the sound velocity in a cylindrically confined Fermi superfluid obeying a power-law equation of state is shown to make use of an improper projection of the sound wave equation. This inaccuracy fully accounts for the difference between their results and those previously reported by Capuzzi et al. [Phys. Rev. A 73, 021603(R) (2006) and cond-mat/0509323]. In this Comment, we show that both approaches lead exactly to the same result when the correct weight function is used in the projection. Plots of the correct behavior of the phonon and monopole-mode spectra in the BCS and unitary limits and in the BEC regime are also shown.