Dynamical Simulation of Sound Propagation in a Highly Elongated Trapped Bose Gas at Finite Temperatures

被引：1

作者：

Arahata, E. ^{[1
]}

Nikuni, T. ^{[2
]}

机构：

[1] Univ Tokyo, Dept Basic Sci, Meguro Ku, Tokyo 1538902, Japan

[2] Tokyo Univ Sci, Fac Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2013年 / 171卷 / 3-4期

关键词：

Quantum gas; First and second sound;

D O I：

10.1007/s10909-012-0829-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We study sound propagation in a Bose-condensed gas confined in a highly elongated harmonic trap at finite temperatures. Our analysis is based on Zaremba-Nikuni-Griffin (ZNG) formalism, which consists of Gross-Pitaevskii equation for the condensate and the kinetic equation for a thermal cloud. We extend ZNG formalism to deal with a highly-anisotropic trap potential, and use it to simulate sound propagation in the two fluid hydrodynamic regime. We use the trap parameters for the experiment that has reported second sound propagation. Our simulation results show that propagation of two sound pulses corresponding to first and second sound can be observed in an intermediate temperature.

引用

页码：369 / 375

页数：7

共 13 条

[1]

Arahata E., ARXIV 1211 1463

[2] Single-particle spectral density of a Bose gas in the two-fluid hydrodynamic regime [J].

Arahata, Emiko ;

Nikuni, Tetsuro ;

Griffin, Allan .

PHYSICAL REVIEW A, 2011, 84 (05)

[3] Damping of condensate oscillations of a trapped Bose gas in a one-dimensional optical lattice at finite temperatures [J].

Arahata, Emiko ;

Nikuni, Tetsuro .

PHYSICAL REVIEW A, 2008, 77 (03)

[4] Sound propagation in elongated superfluid fermionic clouds [J].

Capuzzi, P ;

Vignolo, P ;

Federici, F ;

Tosi, MP .

PHYSICAL REVIEW A, 2006, 73 (02)

[5]

Griffin A, 2009, BOSE-CONDENSED GASES AT FINITE TEMPERATURES, P1, DOI 10.1017/CBO9780511575150

[6] First and second sound in a uniform Bose gas [J].

Griffin, A ;

Zaremba, E .

PHYSICAL REVIEW A, 1997, 56 (06) :4839-4844

[7] Sound modes at the BCS-BEC crossover [J].

Heiselberg, H .

PHYSICAL REVIEW A, 2006, 73 (01)

[8] Second sound and the density response function in uniform superfluid atomic gases [J].

Hu, H. ;

Taylor, E. ;

Liu, X-J ;

Stringari, S. ;

Griffin, A. .

NEW JOURNAL OF PHYSICS, 2010, 12

[9] Modeling Bose-Einstein condensed gases at finite temperatures with N-body simulations -: art. no. 033606 [J].

Jackson, B ;

Zaremba, E .

PHYSICAL REVIEW A, 2002, 66 (03) :18

[10] Measurement of sound velocity in a Fermi gas near a Feshbach resonance [J].

Joseph, J. ;

Clancy, B. ;

Luo, L. ;

Kinast, J. ;

Turlapov, A. ;

Thomas, J. E. .

PHYSICAL REVIEW LETTERS, 2007, 98 (17)

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