Vortex emission from quantum turbulence in superfluid 4He

Yusuke Nago, A. Nishijima, H. Kubo, T. Ogawa, K. Obara, H. Yano, O. Ishikawa, T. Hata

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

An oscillating object can stretch quantized vortices attached to it in superfluids due to the relative superflow, steadily generating quantum turbulence, even in the zero-temperature limit. We report the emission and propagation of quantized vortices from quantum turbulence generated in superfluid 4He at low temperatures. A vortex-free vibrating wire enables us to detect the first collision of vortex rings and therefore to measure the time-of-flight of a vortex emitted from a generator to a detector. The detection times from the start of turbulence generation exhibit an exponential distribution, suggesting that the detection is a Poisson process. Vortices are emitted continuously, but each vortex has a random flight velocity and direction. We estimated the nondetection time and mean detection period from the distribution for two flight distances. By estimating the flight velocity, we find that only vortices with velocities lower than the detector velocity can be detected, even if the sizes of the emitted vortices are smaller than the wire thickness or the vibration amplitude. The ratio of the detection rate as a function of vortex velocity suggests anisotropic emission of vortices from the quantum turbulence.

Original languageEnglish
Article number024511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number2
DOIs
Publication statusPublished - 2013 Jan 22

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Vortex flow
Turbulence
turbulence
vortices
flight
wire
poisson process
Wire
Detectors
vortex rings
detectors
low speed
estimating
generators
vibration
collisions
propagation
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Vortex emission from quantum turbulence in superfluid 4He. / Nago, Yusuke; Nishijima, A.; Kubo, H.; Ogawa, T.; Obara, K.; Yano, H.; Ishikawa, O.; Hata, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 2, 024511, 22.01.2013.

Research output: Contribution to journalArticle

Nago, Y, Nishijima, A, Kubo, H, Ogawa, T, Obara, K, Yano, H, Ishikawa, O & Hata, T 2013, 'Vortex emission from quantum turbulence in superfluid 4He', Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 2, 024511. https://doi.org/10.1103/PhysRevB.87.024511
Nago, Yusuke ; Nishijima, A. ; Kubo, H. ; Ogawa, T. ; Obara, K. ; Yano, H. ; Ishikawa, O. ; Hata, T. / Vortex emission from quantum turbulence in superfluid 4He. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 87, No. 2.
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