Observation of quantum turbulence in superfluid(3)He-B using reflection and transmission of ballistic thermal excitations
Result description
We report measurements of quantum turbulence generated by a vibrating grid in superfluid(3)He-B at zero pressure in the zero temperature limit. Superfluid flow around individual vortex lines Andreev reflects incoming thermal ballistic quasiparticle excitations, and allows noninvasive detection of quantum vortices in He-3-B. We have compared two Andreev reflection-based techniques traditionally used to detect quantum turbulence in the ballistic regime: quasiparticle transmission through and reflection from ballistic vortex rings and a turbulent tangle. We have shown that the two methods are in very good agreement and thus complement each other. Our measurements reveal that vortex rings and a tangle generated by a vibrating grid have a much larger spatial extent than previously realized. Furthermore, we find that a vortex tangle can either pass through an obstacle made from a mesh or diffuse around it. The measured dependence of vortex signal as a function of the distance from the vibrating grid is consistent with a power-law behavior in contrast to turbulence generated by a vibrating wire which is described by an exponential function.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Observation of quantum turbulence in superfluid(3)He-B using reflection and transmission of ballistic thermal excitations
Original language description
We report measurements of quantum turbulence generated by a vibrating grid in superfluid(3)He-B at zero pressure in the zero temperature limit. Superfluid flow around individual vortex lines Andreev reflects incoming thermal ballistic quasiparticle excitations, and allows noninvasive detection of quantum vortices in He-3-B. We have compared two Andreev reflection-based techniques traditionally used to detect quantum turbulence in the ballistic regime: quasiparticle transmission through and reflection from ballistic vortex rings and a turbulent tangle. We have shown that the two methods are in very good agreement and thus complement each other. Our measurements reveal that vortex rings and a tangle generated by a vibrating grid have a much larger spatial extent than previously realized. Furthermore, we find that a vortex tangle can either pass through an obstacle made from a mesh or diffuse around it. The measured dependence of vortex signal as a function of the distance from the vibrating grid is consistent with a power-law behavior in contrast to turbulence generated by a vibrating wire which is described by an exponential function.
Czech name
—
Czech description
—
Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
GA17-03572S: Peculiarities of convective flows and heat transport in cryogenic helium
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review B
ISSN
2469-9950
e-ISSN
—
Volume of the periodical
95
Issue of the periodical within the volume
9
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
—
UT code for WoS article
000399216300002
EID of the result in the Scopus database
2-s2.0-85016161594
Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Condensed matter physics (including formerly solid state physics, supercond.)
Year of implementation
2017