Measurement of sound velocity in a Fermi gas near a Feshbach resonance

被引：153

作者：

Joseph, J. ^{[1
]}

Clancy, B. ^{[1
]}

Luo, L. ^{[1
]}

Kinast, J. ^{[1
]}

Turlapov, A. ^{[1
]}

Thomas, J. E. ^{[1
]}

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.98.170401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Sound waves are excited in an optically trapped degenerate Fermi gas of spin-up and spin-down atoms with magnetically tunable interactions. Measurements are made throughout the crossover region, from a weakly interacting Fermi gas through the resonant Fermi superfluid regime to a Bose condensate of dimer molecules. The measured sound velocities test theories of hydrodynamic wave propagation and predictions of the equation of state. At resonance, the sound velocity exhibits universal scaling with the Fermi velocity, to within 1.8% over a factor of 30 in density.

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页数：4

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共 38 条

[1] Precision measurements of collective oscillations in the BEC-BCS crossover [J].

Altmeyer, A. ;

Riedl, S. ;

Kohstall, C. ;

Wright, M. J. ;

Geursen, R. ;

Bartenstein, M. ;

Chin, C. ;

Denschlag, J. Hecker ;

Grimm, R. .

PHYSICAL REVIEW LETTERS, 2007, 98 (04)

[2] Propagation of sound in a Bose-Einstein condensate [J].

Andrews, MR ;

Kurn, DM ;

Miesner, HJ ;

Durfee, DS ;

Townsend, CG ;

Inouye, S ;

Ketterle, W .

PHYSICAL REVIEW LETTERS, 1997, 79 (04) :553-556

[3]

ASTRAKHARCHIK G, COMMUNICATION

[4] Equation of state and collective frequencies of a trapped Fermi gas [J].

Astrakharchik, G.E. ;

Combescot, R. ;

Leyronas, X. ;

Stringari, S. .

Physical Review Letters, 2005, 95 (03)

[5] Equation of state of a Fermi gas in the BEC-BCS crossover: A quantum Monte Carlo study [J].

Astrakharchik, GE ;

Boronat, J ;

Casulleras, J ;

Giorgini, S .

PHYSICAL REVIEW LETTERS, 2004, 93 (20) :200404-1

[6] Precise determination of 6Li cold collision parameters by radio-frequency spectroscopy on weakly bound molecules -: art. no. 103201 [J].

Bartenstein, M ;

Altmeyer, A ;

Riedl, S ;

Geursen, R ;

Jochim, S ;

Chin, C ;

Denschlag, JH ;

Grimm, R ;

Simoni, A ;

Tiesinga, E ;

Williams, CJ ;

Julienne, PS .

PHYSICAL REVIEW LETTERS, 2005, 94 (10)

[7] Collective excitations of a degenerate gas at the BEC-BCS crossover [J].

Bartenstein, M ;

Altmeyer, A ;

Riedl, S ;

Jochim, S ;

Chin, C ;

Denschlag, JH ;

Grimm, R .

PHYSICAL REVIEW LETTERS, 2004, 92 (20) :203201-1

[8] Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas [J].

Bartenstein, M ;

Altmeyer, A ;

Riedl, S ;

Jochim, S ;

Chin, C ;

Denschlag, JH ;

Grimm, R .

PHYSICAL REVIEW LETTERS, 2004, 92 (12) :120401-1

[9] Experimental study of the BEC-BCS crossover region in lithium 6 [J].

Bourdel, T ;

Khaykovich, L ;

Cubizolles, J ;

Zhang, J ;

Chevy, F ;

Teichmann, M ;

Tarruell, L ;

Kokkelmans, SJJMF ;

Salomon, C .

PHYSICAL REVIEW LETTERS, 2004, 93 (05) :050401-1

[10] Collective oscillations of a trapped fermi gas near the unitary limit [J].

Bulgac, A ;

Bertsch, GF .

PHYSICAL REVIEW LETTERS, 2005, 94 (07)

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