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Breaking the superfluid speed limit in a fermionic condensate

Research output: Contribution to Journal/Magazine › Letter › peer-review

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Breaking the superfluid speed limit in a fermionic condensate. / Bradley, David Ian; Fisher, Shaun Neil; Guénault, Anthony Michael et al.
In: Nature Physics, Vol. 12, No. 11, 11.2016, p. 1017-1021.

Research output: Contribution to Journal/Magazine › Letter › peer-review

Harvard

Bradley, DI, Fisher, SN, Guénault, AM, Haley, RP, Lawson, C, Pickett, GR, Schanen, R, Skyba, M, Tsepelin, V & Zmeev, D 2016, 'Breaking the superfluid speed limit in a fermionic condensate', Nature Physics, vol. 12, no. 11, pp. 1017-1021. https://doi.org/10.1038/nphys3813

APA

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Lawson, C., Pickett, G. R., Schanen, R., Skyba, M., Tsepelin, V., & Zmeev, D. (2016). Breaking the superfluid speed limit in a fermionic condensate. Nature Physics, 12(11), 1017-1021. https://doi.org/10.1038/nphys3813

Vancouver

Bradley DI, Fisher SN, Guénault AM, Haley RP, Lawson C, Pickett GR et al. Breaking the superfluid speed limit in a fermionic condensate. Nature Physics. 2016 Nov;12(11):1017-1021. Epub 2016 Jul 18. doi: 10.1038/nphys3813

Author

Bradley, David Ian ; Fisher, Shaun Neil ; Guénault, Anthony Michael et al. / Breaking the superfluid speed limit in a fermionic condensate. In: Nature Physics. 2016 ; Vol. 12, No. 11. pp. 1017-1021.

Bibtex

@article{3489e6530371433381d2058cd82d5f71,
title = "Breaking the superfluid speed limit in a fermionic condensate",
abstract = "Coherent condensates appear as emergent phenomena in many systems. They share the characteristic feature of an energy gap separating the lowest excitations from the condensate ground state. This implies that a scattering object, moving through the system with high enough velocity for the excitation spectrum in the scatterer frame to become gapless, can create excitations at no energy cost, initiating the breakdown of the condensate—the well-known Landau velocity. Whereas, for the neutral fermionic superfluid 3He-B in the T = 0 limit, flow around an oscillating body displays a very clear critical velocity for the onset of dissipation, here we show that for uniform linear motion there is no discontinuity whatsoever in the dissipation as the Landau critical velocity is passed and exceeded. Given the importance of the Landau velocity for our understanding of superfluidity, this result is unexpected, with implications for dissipative effects of moving objects in all coherent condensate systems.",
author = "Bradley, {David Ian} and Fisher, {Shaun Neil} and Gu{\'e}nault, {Anthony Michael} and Haley, {Richard Peter} and Christopher Lawson and Pickett, {George Richard} and Roch Schanen and Maros Skyba and Viktor Tsepelin and Dmitriy Zmeev",
year = "2016",
month = nov,
doi = "10.1038/nphys3813",
language = "English",
volume = "12",
pages = "1017--1021",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "11",

}

RIS

TY - JOUR

T1 - Breaking the superfluid speed limit in a fermionic condensate

AU - Bradley, David Ian

AU - Fisher, Shaun Neil

AU - Guénault, Anthony Michael

AU - Haley, Richard Peter

AU - Lawson, Christopher

AU - Pickett, George Richard

AU - Schanen, Roch

AU - Skyba, Maros

AU - Tsepelin, Viktor

AU - Zmeev, Dmitriy

PY - 2016/11

Y1 - 2016/11

N2 - Coherent condensates appear as emergent phenomena in many systems. They share the characteristic feature of an energy gap separating the lowest excitations from the condensate ground state. This implies that a scattering object, moving through the system with high enough velocity for the excitation spectrum in the scatterer frame to become gapless, can create excitations at no energy cost, initiating the breakdown of the condensate—the well-known Landau velocity. Whereas, for the neutral fermionic superfluid 3He-B in the T = 0 limit, flow around an oscillating body displays a very clear critical velocity for the onset of dissipation, here we show that for uniform linear motion there is no discontinuity whatsoever in the dissipation as the Landau critical velocity is passed and exceeded. Given the importance of the Landau velocity for our understanding of superfluidity, this result is unexpected, with implications for dissipative effects of moving objects in all coherent condensate systems.

AB - Coherent condensates appear as emergent phenomena in many systems. They share the characteristic feature of an energy gap separating the lowest excitations from the condensate ground state. This implies that a scattering object, moving through the system with high enough velocity for the excitation spectrum in the scatterer frame to become gapless, can create excitations at no energy cost, initiating the breakdown of the condensate—the well-known Landau velocity. Whereas, for the neutral fermionic superfluid 3He-B in the T = 0 limit, flow around an oscillating body displays a very clear critical velocity for the onset of dissipation, here we show that for uniform linear motion there is no discontinuity whatsoever in the dissipation as the Landau critical velocity is passed and exceeded. Given the importance of the Landau velocity for our understanding of superfluidity, this result is unexpected, with implications for dissipative effects of moving objects in all coherent condensate systems.

U2 - 10.1038/nphys3813

DO - 10.1038/nphys3813

M3 - Letter

VL - 12

SP - 1017

EP - 1021

JO - Nature Physics

JF - Nature Physics

SN - 1745-2473

IS - 11

ER -