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  • 1
    Electronic Resource
    Electronic Resource
    Simple models for heterogeneous catalysis: Phase transition-like behavior in nonequilibrium systems (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 731-741 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A simple model for heterogeneous catalysis, recently introduced by Ziff, Gulari, and Barshad (ZGB), has been explored using computer simulation. This is a nonequilibrium model which exhibits phase transition-like behavior. The only parameter in this model (Y) sets the ratio with which two reactive species (A and B2) are fed to the surface (lattice). On the square lattice, ZGB found a range of values of this parameter for which steady states with nonzero A and B concentrations occur. Outside of this range, the surface becomes completely covered with A or B sites. The range of Y values corresponding to steady state with nonzero A and B concentrations is bounded by two "critical'' values Y1 and Y2. For values of Y close to but above Y1 we have obtained approximate values for the exponents which describe the dependence of the steady-state densities of A and B sites on (Y−Y1). These exponents both seem to have the same value independent of lattice details. We have extended the work of ZGB to the hexagonal lattice, one-dimensional lattice, and narrow strips. The results obtained for the hexagonal lattice are qualitatively similar to those obtained for the square lattice. For the 1D lattice and strips with a width of 2 lattice units, steady states with nonzero A and B site concentrations are not found. For widths of 3 or more lattice units, such steady states are found and the range of the relative probability parameter over which this behavior occurs grows steadily with increasing strip width. We have also obtained new results for the more simple C+D product reaction. Here C and D occupy single lattice sites and react immediately if they are nearest neighbors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453570
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  • 2
    Electronic Resource
    Electronic Resource
    First steps on the ladder (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 12-13 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the late Bernd Matthias's rules for finding new superconducting materials was "Never listen to theorists." On first sight this appears to be borne out by the report of the absence of superconductivity in the hole-doped 'ladder' compound La1SrCuO2 5 by Hiroi and Takano1 on page 41 of this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377012a0
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  • 3
    Electronic Resource
    Electronic Resource
    Density matrix renormalization group calculations for doped Hubbard ladders (1995)
    Springer
    Journal of low temperature physics 99 (1995), S. 593-598 
    Details
    ISSN: 1573-7357
    Keywords: 74.20Hi ; 75.10Lp ; 71.10+x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The properties of the two-chain Hubbard Model doped away from half-filling are investigated using the density matrix renormalization group. A finite spin gap exists over a range of interchain hopping strength t⊥. A resonating valence bond ansatz provides an intuitive picture of the origin of the spin liquid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752347
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  • 4
    Electronic Resource
    Electronic Resource
    Odd frequency pairing in superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 501-504 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The properties of a superconductor having an energy gap function Δk(ω n ) which is an odd function of frequencyω n, or time, are investigated. One finds (a) the allowed pair orbital angular momenta for spin zero and spin one are interchanged, permittingS= 0, l=1 and S=1, l=0 condensates; (b) there exists an equal-time order parameter corresponding to condensation of a spin wave coupled to two fermions, in contrast to the conventional timereversed fermion pair condensate; an explicit energy gap equation is derived for this composite operator condensate; (c) the coherence factors are shown to be reversed from those of conventional pairing, forω〉2Δ, removing the peak in thea+C conductivityσ(ω) and generating a peak in theω〉2Δ acoustic attenuation as a function of temperature; (d) the Josephson current vanishes between an even and odd frequency superconductor, and vanishes to leading order in the tunneling rates ∼t 12 2 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728448
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