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  • 1
    Electronic Resource
    Electronic Resource
    Fermion kinetics in the Falicov-Kimball limit of the three-band Emery model (2005)
    Springer
    The European physical journal 43 (2005), S. 319-331 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The three-band Emery model is reduced to a single-particle quantum model of Falicov-Kimball type, by allowing only up-spins to hop, and forbidding double occupation by projection. It is used to study the effects of geometric obstruction on mobile fermions in thermodynamic equilibrium. For low hopping overlap, there appears a plateau in the entropy, due to charge correlations, and related to real-space disorder. For large overlap, the equilibrium thermopower susceptibility remains anomalous, with a sign opposite to the one predicted from the single-particle density of states. The heat capacity and non-Fermi liquid response are discussed in the context of similar results in the literature. All results are obtained by evaluation of an effective single-particle free-energy operator in closed form. The method to obtain this operator is described in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2005-00059-9
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  • 2
    Electronic Resource
    Electronic Resource
    The Gutzwiller wave function as a disentanglement prescription (2004)
    Springer
    The European physical journal 42 (2004), S. 337-344 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The Gutzwiller variational wave function is shown to correspond to a particular disentanglement of the thermal evolution operator, and to be physically consistent only in the temperature range $U\ll kT\ll E_F$ , the Fermi energy of the non-interacting system. The correspondence is established without using the Gutzwiller approximation. It provides a systematic procedure for extending the ansatz to the strong-coupling regime. This is carried out to infinite order in a dominant class of commutators. The calculation shows that the classical idea of suppressing double occupation is replaced at low temperatures by a quantum RVB-like condition, which involves phases at neighboring sites. Low-energy phenomenologies are discussed in the light of this result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00388-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gaussian polynomial method for spin-dependent level density and new formula for spin distribution (1993)
    Springer
    The European physical journal 345 (1993), S. 343-357 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ma ; 02.90.+p
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Large-scale combinatorial calculations of level densities were performed for selected nuclei using Gaussian polynomial generating function method (GPM). Contrary to the results of previous combinatorial calculations, we find a good agreement of the combinatorial total level densities and Bethe formula. Combinatorial GPM calculations were performed also for spin-dependent level densities and comparison is made with various algebraic formulas. On the basis of our GPM calculations we propose a new phenomenological spin-dependent level density formula, which in the low-spin limit reduces to the spin-dependent formula of Bethe. The new formula (24) is for all spins factorized into the product of total level density and spin distribution function, where the spin distribution function (25) contains an additional spin correction parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282895
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Analogs of Gallagher-Moszkowski bands in IBFFM — A relation to spectrum-generating supersymmetry? (1987)
    Springer
    The European physical journal 327 (1987), S. 291-294 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 21.60.Fw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The quantal analogs of the Gallagher-Moszkowski bands in the Interacting boson-fermion-fermion model (IBFFM) withSU (3) boson core are associated with the exact quantum numberKj p+jn and approximate quantum numberK-¦j p-jn¦ of IBFFM. For characteristic ratiosГ/δ it is shown that theK c=0 band in even-even IBM system, theK=j p andK=j n bands in the corresponding odd-even (IBFM) systems and theK=j p+j band in the corresponding odd-odd IBFFM system exhibit the supermultiplet pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284452
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    Paper (German National Licenses)
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