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  • 1
    Electronic Resource
    Electronic Resource
    An intrinsic velocity-independent criterion for superfluid turbulence (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 424 (2003), S. 1022-1025 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hydrodynamic flow in classical and quantum fluids can be either laminar or turbulent. Vorticity in turbulent flow is often modelled with vortex filaments. While this represents an idealization in classical fluids, vortices are topologically stable quantized objects in superfluids. Superfluid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01880
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  • 2
    Electronic Resource
    Electronic Resource
    Momentum creation by vortices in superfluid 3 He as a model of primordial baryogenesis (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 689-692 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To explain the creation of matter in the early Universe we begin by recalling the relationship E2 = mc4 + p2(? between energy E and momentum p for relativistic particles with rest mass m0 (c is the velocity of light). Dirac realized that the square root of this equation, E= ± (m20c4 +pV)i ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386689a0
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  • 3
    Electronic Resource
    Electronic Resource
    Vortex formation in neutron-irradiated superfluid 3 He as an analogue of cosmological defect formation (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 334-336 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Laboratory experiments intended to test different theories of cosmological defect formation have recently been conducted in liquid crystals7'8 and superfluid 4He (ref. 9). Use of the superfluid phases of liquid 3He allows further progress in these Big Bang simulations. 3He has several advantages ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/382334a0
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  • 4
    Electronic Resource
    Electronic Resource
    Double-quantum vortex in superfluid 3 He-A (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 404 (2000), S. 471-473 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Linear defects are generic in continuous media. In quantum systems they appear as topological line defects which are associated with a circulating persistent current. In relativistic quantum field theories they are known as cosmic strings, in superconductors as quantized flux lines, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35006583
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  • 5
    Electronic Resource
    Electronic Resource
    Glass state of superfluid 3He-A in an aerogel (1996)
    Springer
    JETP letters 63 (1996), S. 301-304 
    Details
    ISSN: 1090-6487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The glass states formed in superfluid 3He confined in an aerogel are discussed. If the short-range order corresponds to the A-phase state, the glass state is nonsuperfluid in the long-wavelength limit. Superfluidity can be restored by application of a small mass current. The transitions between the superfluid and nonsuperfluid glass states can be triggered by small magnetic fields and by the change of the tipping angle of the magnetization in NMR experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567020
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  • 6
    Electronic Resource
    Electronic Resource
    Fermionic entropy of the vortex state in d-wave superconductors (1997)
    Springer
    JETP letters 65 (1997), S. 491-496 
    Details
    ISSN: 1090-6487
    Keywords: 74.20.−z ; 74.72.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In d-wave superconductors the electronic entropy associated with an isolated vortex diverges logarithmically with the size of the system even at low temperatures. In the vortex array the entropy per vortex per layer, S V , is much larger than k B and depends on the distribution of the velocity field v s around the vortex. If there is a first-order transition upon a change of the velocity distribution, then there will be a big entropy jump ΔS V ∼k B at the transition. This entropy jump comes from the electronic degrees of freedom on the vortex background, which is modified by the vortex transition. This can explain the big jump in the entropy observed in the so-called vortex-melting transition [A. Junod, M. Roulin, J-Y. Genoud et al., Physica C, to be published], in which the vortex array and thus the velocity field are redistributed. The possibility of the Berezinskii-Kosterlitz-Thouless transition in the 3-dimensional d-wave superconductor due to the fermionic bound states in the vortex background is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567377
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  • 7
    Electronic Resource
    Electronic Resource
    Critical velocity and event horizon in pair-correlated systems with “relativistic” fermionic quasiparticles (1998)
    Springer
    JETP letters 67 (1998), S. 140-145 
    Details
    ISSN: 1090-6487
    Keywords: 67.20.+k, 74.20.−z ; 04.60.−m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The condition for the appearance of an event horizon is considered in pair-correlated systems (superfluids and superconductors) in which the fermionic quasiparticles obey “relativistic” equations. In these systems the Landau critical velocity of superflow corresponds to the speed of light. In conventional systems, such as s-wave superconductors, the superflow remains stable even above the Landau threshold. We show, however, that, in “ relativistic” systems, the quantum vacuum becomes unstable and the superflow collapses after the “speed of light” is reached, so that the horizon cannot appear. Thus an equilibrium dissipationless superflow state and the horizon are incompatible on account of quantum effects. This negative result is consistent with the quantum Hawking radiation from the horizon, which would lead to a dissipation of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567637
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  • 8
    Electronic Resource
    Electronic Resource
    Poisson bracket scheme for vortex dynamics in superfluids and superconductors and the effect of the band structure of the crystal (1996)
    Springer
    JETP letters 64 (1996), S. 845-852 
    Details
    ISSN: 1090-6487
    Keywords: 03.40.Gc ; 47.37.+q ; 67.40.Vs ; 74.60.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Poisson brackets for the Hamiltonian dynamics of vortices are discussed for 3 regimes, in which the dissipation can be neglected and the vortex dynamics is reversible: (i) The superclean regime, in which the spectral flow is suppressed. (ii) The regime in which the fermions are pinned by the crystal lattice. This includes the regime of extreme spectral flow of fermions in the vortex core: these fermions are effectively pinned by the normal component. (iii) The case when the vortices are strongly pinned by the normal component. All these limits are described by the single parameter C 0, the physical meaning of which is discussed for superconductors containing several bands of electrons and holes. The effect of the topology of the Fermi surface on the vortex dynamics is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567257
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  • 9
    Electronic Resource
    Electronic Resource
    Rotational quantum friction in superfluids: Radiation from object rotating in superfluid vacuum (1999)
    Springer
    JETP letters 69 (1999), S. 281-287 
    Details
    ISSN: 1090-6487
    Keywords: 03.65.−w ; 67.40.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The friction experienced by a body rotating in a superfluid liquid at T=0 is discussed. The effect is analogous to the amplification of electromagnetic radiation and spontaneous emission by a body or black hole rotating in the quantum vacuum, first discussed by Zel’dovich and Starobinsky. The friction is caused by the interaction of the part of the liquid which is rigidly connected with the rotating body and thus represents a comoving detector, with the “Minkowski” superfluid vacuum outside the body. The emission process is the quantum tunneling of quasiparticles from the detector to the ergoregion, where the energy of quasiparticles is negative in the rotating frame. This quantum rotational friction caused by the emission of quasiparticles is estimated for phonons and rotons in superfluid 4He and for Bogoliubov fermions in superfluid 3He.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568024
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  • 10
    Electronic Resource
    Electronic Resource
    Singularity of the vortex density of states in d-wave superconductors (1996)
    Springer
    JETP letters 64 (1996), S. 690-694 
    Details
    ISSN: 1090-6487
    Keywords: 74.20.−z ; 74.72.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In d-wave superconductors, the electronic density of states (DOS) induced by a vortex exhibits a divergence at low energies: N vortex(E) ∼1/|E|. This divergence is the result of gap nodes in the spectrum of excitation outside the vortex core. The heat capacity in two regimes, T 2/T c 2 ≫ B/B c 2 and T 2/T c 2 ≪ B/B c 2, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567283
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