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  • 67.57.−z  (3)
  • 74.60.Ge  (3)
  • 67.40.−w  (1)
  • 1995-1999  (7)
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Keywords
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  • 1995-1999  (7)
Year
  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Vierbein walls in condensed matter (1999)
    Springer
    JETP letters 70 (1999), S. 711-716 
    Details
    ISSN: 1090-6487
    Keywords: 67.57.−z ; 74.20.−z ; 04.20.Gz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effective field, which plays the part of the vierbein in general relativity, can have topologically stable surfaces, vierbein domain walls, at which the effective contravariant metric is degenerate. We consider vierbein walls separating domains with flat spacetime which are not causally connected at the classical level. The possibility of a quantum mechanical connection between the domains is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568251
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  • 4
    Electronic Resource
    Electronic Resource
    Comment on vortex mass and quantum tunneling of vortices (1997)
    Springer
    JETP letters 65 (1997), S. 217-223 
    Details
    ISSN: 1090-6487
    Keywords: 74.60.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Vortex mass in Fermi superfluids and superconductors and its influence on quantum tunneling of vortices are discussed. The vortex mass is essentially enhanced due to the fermion zero modes in the core of the vortex: the bound states of the Bogoliubov quasiparticles localized in the core. These bound states form the normal component, which is nonzero even in the low-temperature limit. In the collisionless regime ω 0 τ≫1 the normal component trapped by the vortex is unbound from the normal component in a bulk superfluid/superconductor and adds to the inertial mass of the moving vortex. In a d-wave superconductor the vortex mass has an additional factor of (B c2/B)1/2 due to the gap nodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567299
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  • 5
    Electronic Resource
    Electronic Resource
    Effective spacetime and Hawking radiation from a moving domain wall in a thin film of 3He-A (1998)
    Springer
    JETP letters 68 (1998), S. 874-880 
    Details
    ISSN: 1090-6487
    Keywords: 67.57.−z ; 04.20.Gz ; 67.70.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An event horizon for “relativistic” fermionic quasiparticles can be constructed in a thin film of superfluid 3He-A. The quasiparticles see an effective “gravitational” field which is induced by a topological soliton of the order parameter. Within the soliton the “speed of light” crosses zero and changes sign. When the soliton moves, two planar event horizons (black hole and white hole) appear, with a curvature singularity between them. Aside from the singularity, the effective spacetime is incomplete at future and past boundaries, but the quasiparticles cannot escape there because the nonrelativistic corrections become important as the blueshift grows, yielding “superluminal” trajectories. The question of Hawking radiation from the moving soliton is discussed but not resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567808
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  • 6
    Electronic Resource
    Electronic Resource
    On induced CPT-odd Chern-Simons terms in the 3+1 effective action (1999)
    Springer
    JETP letters 70 (1999), S. 1-4 
    Details
    ISSN: 1090-6487
    Keywords: 11.15.−q ; 11.10.Ef ; 11.30.Er ; 67.57.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper was originally designated as a Comment on the paper by R. Jackiw and V. A. Kostelecký, Phys. Rev. Lett. 82, 3572 (1999). It gives an example of a fermionic system in which the CPT-odd Chern-Simons terms in the effective action are unambiguously induced by chiral fermions: superfluid 3He-A. In this system the Lorentz and gauge invariances are both violated at high energy, but the behavior of the system beyond the cutoff is known. This allows one to construct a CPT-odd action which combines the conventional 3+1 CS term and the mixed axial-gravitational CS term discussed by G. E. Volovik and A. Vilenkin, http://xxx.lanl.gov/abs/hep-ph/9905460. The influence of the CS term on the dynamics of the effective gauge field has been observed experimentally in rotating 3He-A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568120
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  • 7
    Electronic Resource
    Electronic Resource
    Fermion zero modes on vortices in chiral superconductors (1999)
    Springer
    JETP letters 70 (1999), S. 609-614 
    Details
    ISSN: 1090-6487
    Keywords: 74.20.Mn ; 74.60.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy levels of fermions bound to the vortex core are considered for the general case of chiral superconductors. There are two classes of chiral superconductivity: in the class I superconducting state the axisymmetric singly quantized vortex has the same energy spectrum of bound states as in an s-wave superconductor: E=(n+1/2)ω0, with integral n. In class II the corresponding spectrum is E=nω0 and thus contains a state with exactly zero energy. The effect of a single impurity on the spectrum of bound states is also considered. For class I the spectrum acquires the doubled period ΔE=2ω0 and consists of two equidistant sets of levels, in accordance with A. I. Larkin and Yu. N. Ovchinnikov, Phys. Rev. B 57, 5457 (1998). For the class II states the spectrum is not influenced by a single impurity if the same approximation is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568223
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