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In superfluid systems several sound modes can be excited, as for example first and second sound in liquid helium.
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L.P. Pitaevskii and S. Stringari, “Landau damping in dilute Bose gases,” Phys. Lett. A 235
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J.L. Ville, T. Bienaimé, R. Saint-Jalm, L. Corman, M. Aidelsburger, L. Chomaz, K. Kleinlein, D. Perconte, S. Nascimbène, J . Dalibard, and J. Beugnon, “Loading and compression of a single two-dimensional Bose gas in an optical accordion,” Phys. Rev. A. 95
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M. Aidelsburger, J. L. Ville, R. Saint-Jalm, S. Nascimbène, J. Dalibard, and J. Beugnon, “Relaxation dynamics in the merging of N N independent condensates,” Phys. Rev. Lett. 119
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M. Zwierlein, talk at the BEC 2017 Frontiers in Quantum Gases, Sant Feliu de Guixols
2017
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M. Ota and S. Stringari, “Second sound in a two-dimensional Bose gas: From the weakly to the strongly interacting regime,” Phys. Rev. A 97
2018
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K. Hueck, N. Luick, L. Sobirey, J. Siegl, T. Lompe, and H. Moritz, “Two-dimensional homogeneous fermi gases,” Phys. Rev. Lett. 120
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T. Ozawa and S. Stringari, “Discontinuities in the first and second sound velocities at the Berezinskii-Kosterlitz-Thouless transition,” Phys. Rev. Lett. 112
2014
Cited alongside, same era.
R. Meppelink, S. B. Koller, and P. van der Straten, “Sound propagation in a Bose-Einstein condensate at finite temperatures,” Phys. Rev. A 80
Cited in the paper.
The value of \mathaccentV t i l d e 07 E g \mathaccentV{tilde}07Eg is slightly modified by the effect of interactions. We estimate that \mathaccentV t i l d e 07 E g \mathaccentV{tilde}07Eg varies by about 10% for the range of surface densities explored in this work
Cited in the paper.
This removal is realized by a partial transfer of the atoms to the | F = 2 , m = 0 ⟩ |F=2,m=0\rangle state with a microwave resonant field and a subsequent blasting of the transferred fraction with a resonant laser beam
Cited in the paper.
“See Supplemental Materials,”
Cited in the paper.
We did not observe any excitation along the x x direction
Cited in the paper.
A related experimental study of the evolution of the fundamental mode of a 3D uniform weakly interacting Bose gas can be found in Ref. [ Navon16
Cited in the paper.
2018
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