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  • 1
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    Physical realization of the generalized fully frustrated XY model in an array of SFS junctions (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-08-11
    Description: Author(s): S. E. Korshunov We show that a physical realization of the phase diagram proposed by Minnhagen et al. [ Phys. Rev. B 78 , 184432 (2008) ] for the so-called generalized fully frustrated XY model on a square lattice can be achieved in arrays of superconductor-ferromagnet-superconductor junctions near the transition of t… [Phys. Rev. B 92, 064506] Published Mon Aug 10, 2015
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Continuous interpolation between the fully frustrated Ising and quantum dimer models (2011)
    American Physical Society (APS)
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    Publication Date: 2011-06-17
    Description: Author(s): Dmitri A. Ivanov and S. E. Korshunov We propose a quantum model interpolating between the fully frustrated spin-1/2 Ising model in a transverse field and a dimer model. This model contains a resonating-valence-bond phase, including a line with an exactly solvable ground state of Rokhsar-Kivelson type. We discuss the phase diagrams of t... [Phys. Rev. B 83, 235129] Published Thu Jun 16, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
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    Ordered phases and phase transitions in the fully frustrated XY model on a honeycomb lattice (2012)
    American Physical Society (APS)
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    Publication Date: 2012-04-27
    Description: Author(s): S. E. Korshunov The phase diagram of the fully frustrated X Y model on a honeycomb lattice is shown to incorporate three different ordered phases. In the most unusual of them, a long-range order is related not to the dominance of a particular periodic vortex pattern but to the orientation of the zero-energy domain w... [Phys. Rev. B 85, 134526] Published Thu Apr 26, 2012
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
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    Degeneracy and ordering of the noncoplanar phase of the classical bilinear-biquadratic Heisenberg model on the triangular lattice (2012)
    American Physical Society (APS)
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    Publication Date: 2012-05-15
    Description: Author(s): S. E. Korshunov, F. Mila, and K. Penc We investigate the zero-temperature behavior of the classical Heisenberg model on the triangular lattice in which the competition between exchange interactions of different orders favors a relative angle between neighboring spins Φ ∈(0,2 π /3) . In this situation, the ground states are noncoplanar and h... [Phys. Rev. B 85, 174420] Published Mon May 14, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 5
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    Phase diagram of the fully frustrated transverse-field Ising model on the honeycomb lattice (2011)
    American Physical Society (APS)
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    Publication Date: 2011-02-04
    Description: Author(s): T. Coletta, J.-D. Picon, S. E. Korshunov, and F. Mila Motivated by the current interest in the quantum dimer model on the triangular lattice, we investigate the phase diagram of the closely related fully frustrated transverse-field Ising model on the honeycomb lattice using classical and semiclassical approximations. We show that, in addition to the fu... [Phys. Rev. B 83, 054402] Published Thu Feb 03, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
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    Topics: Physics
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  • 6
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    Finite-temperature phase transitions in the quantum fully frustrated transverse-field Ising models (2012)
    American Physical Society (APS)
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    Publication Date: 2012-07-27
    Description: Author(s): S. E. Korshunov The quantum antiferromagnetic spin-1/2 Ising model on a triangular lattice and analogous fully frustrated Ising model on a square lattice with quantum fluctuation induced by the application of the transverse magnetic field are studied at finite temperatures by constructing an exact mapping onto a pu... [Phys. Rev. B 86, 014429] Published Thu Jul 26, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
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    Topics: Physics
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  • 7
    Electronic Resource
    Electronic Resource
    Parity effect and charge-binding transition in submicron Josephson junction arrays (1997)
    Springer
    JETP letters 65 (1997), S. 566-571 
    Details
    ISSN: 1090-6487
    Keywords: 74.50.+r ; 74.80.Dm ; 73.23.Hk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We reconsider the Berezinski $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} $$ -Kosterlitz-Thouless (BKT) transition to an insulating state in Coulomb-dominated Josephson junction arrays. We show that the previously predicted picture of the Cooper-pair BKT transition at T=T 2 is valid only under the condition that T 2 is considerably below the parity-effect temperature T*≈0.1Δ, and that even in that case it is not a rigorous phase transition but only a crossover, whereas the real phase transition takes place at T 1=T 2/4. Our theory is in agreement with available experimental data on Coulomb-dominated Josephson arrays and also sheds some light on the origin of the unusual reentrant temperature dependence of the resistivity in an array with a nearly critical ratio E C /E J .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567397
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  • 8
    Electronic Resource
    Electronic Resource
    Stability of shock waves with finite relaxation region (1982)
    Springer
    Fluid dynamics 17 (1982), S. 802-806 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A theoretical investigation is made into the amplification of sound in a moving nonequilibrium medium and it is shown that an instability can arise in a sufficiently strong shock wave accompanied by an exothermic process with finite relaxation region, the instability being due to the spontaneous growth of fluctuations resulting from amplification of acoustic waves in the region of exothermic relaxation and their “trapping” in a narrow layer near the shock wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090171
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  • 9
    Electronic Resource
    Electronic Resource
    Phase transitions in two-dimensional uniformly frustratedXY models. I. Antiferromagnetic model on a triangular lattice (1986)
    Springer
    Journal of statistical physics 43 (1986), S. 1-16 
    Details
    ISSN: 1572-9613
    Keywords: Two-dimensional systems ; phase transitions ; frustratedXY models ; antiferromagneticXY model ; topological excitations ; fractional vortices ; Coulomb gas ; Josephson junctions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A most popular model in the family of two-dimensional uniformly-frustratedXY models is the antiferromagnetic model on a triangular lattice [AFXY(t) model]. Its ground state is both continuously and twofold discretely degenerated. Different phase transitions possible in such systems are investigated. Relevant topological excitations are analyzed and a new class of such (vortices with a fractional number of circulation quanta) is discovered. Their role in determining the properties of the system proves itself essential. The characteristics of phase transitions related to breaking of discrete and continuous symmetries change. The phase diagram of the “generalized” AFXY(t) model is constructed. The results obtained are rederived in the representation of the Coulomb gas with half-integer charges, equivalent to the AFXY(t) model with the Berezinskii-Villain interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010569
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  • 10
    Electronic Resource
    Electronic Resource
    Phase transitions in two-dimensional uniformly frustratedXY models. II. General scheme (1986)
    Springer
    Journal of statistical physics 43 (1986), S. 17-32 
    Details
    ISSN: 1572-9613
    Keywords: Two-dimensional systems ; phase transitions ; frustratedXY models ; topological excitations ; fractional vortices ; Josephson junctions ; superfluid3He-A thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For two-dimensional uniformly frustratedXY models the group of symmetry spontaneously broken in the ground state is a cross product of the group of two-dimensional rotations by some discrete group of finite order. Different possibilities of phase transitions in such systems are investigated. The transition to the Coulomb gas with noninteger charges is widely used when analyzing the properties of relevant topological excitations. The number of these excitations includes not only domain walls and traditional (integer) vortices, but also vortices with a fractional number of circulation quanta which are to be localized at bends and intersections of domain walls. The types of possible phase transitions prove to be dependent on their relative sequence: in the case the vanishing of domain wall free energy occurs earlier (at increasing temperature) than the dissociation of pairs of ordinary vortices, the second phase transition is to be associated with dissociation of pairs of fractional vortices. The general statements are illustrated with a number of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010570
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