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  • 1
    Digitale Medien
    Digitale Medien
    The charge-transfer gap within the Gutzwiller approximation
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 174 (1991), S. 199-207 
    Details
    ISSN: 0921-4534
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)90437-4
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  • 2
    Digitale Medien
    Digitale Medien
    From mott transition to charge-transfer gap in the Emery model
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 167 (1990), S. 359-362 
    Details
    ISSN: 0921-4534
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(90)90355-I
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  • 3
    Digitale Medien
    Digitale Medien
    Instanton approach to the conductivity of a disordered solid
    Amsterdam : Elsevier
    Nuclear Physics, Section B 348 (1991), S. 766-786 
    Details
    ISSN: 0550-3213
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0550-3213(91)90214-I
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  • 4
    Digitale Medien
    Digitale Medien
    The thermodynamic density of states of the Emery model
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 125 (1993), S. 368-370 
    Details
    ISSN: 0304-8853
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(93)90112-F
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  • 5
    Digitale Medien
    Digitale Medien
    The energy-scale-dependent composite operator method for the single-impurity Anderson model (2004)
    Springer
    The European physical journal 37 (2004), S. 465-471 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The recently developed energy-scale-dependent Composite Operator Method is applied to the single-impurity Anderson model. A fully self-consistent solution is given and analyzed. At very low temperatures, the density of states presents, on the top of the high-energy background, a Kondo-like peak whose parameter dependence is discussed in detail. The proposed method reproduces the exact results known in the literature with very low numerical effort and it is applicable for arbitrary values of the external parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2004-00082-4
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  • 6
    Digitale Medien
    Digitale Medien
    The bandstructure of the copperoxide-plane including the singlet band (1991)
    Springer
    The European physical journal 85 (1991), S. 169-173 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effects of the Zhang-Rice singlet are included into the RPA-treatment of the Emery model by considering an additional singlet operator. The Fermi level of the doped, paramagnetic case is found within the singlet band. In agreement with the experiments, the dispersion of this band is similar to ordinary bandstructure calculations but it has a reduced bandwidth and is mainly of oxygen character.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01313217
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  • 7
    Digitale Medien
    Digitale Medien
    Effective Hubbard model for Zn-doped CuO plane (1999)
    Springer
    The European physical journal 10 (1999), S. 487-495 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 71.55.-i Impurity and defect levels - 74.72.-h High- compounds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: In the framework of the cell-perturbation method for the original p-d model an effective two-band Hubbard model for the CuO2 plane with Zn impurities is derived. Zn impurities are modelled by Wanni r oxygen one-hole states at vacant Cu sites. The model is based on the results of band structure calculations carried out within the local-density approximation. Further reduction to an extended t-J model shows a large ferromagnetic superexchange interaction between the Cu spin with the nearest virtual oxygen spin in the Zn cell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510050878
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  • 8
    Digitale Medien
    Digitale Medien
    Electronic spectrum in a microscopical model for the Zn-doped CuO2 plane (2000)
    Springer
    The European physical journal 18 (2000), S. 377-384 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We consider a microscopical model for the Zn-doped CuO2 plane with Zn impurities being described as vacancies for the d-states on Cu sites. A reduction of the original p-d model to an effective one-band model results in the t-J model with vacancies for the spin 1/2 d-states at the Zn-sites. By employing the T-matrix formalism for the Green functions in terms of the Hubbard operators the density of electronic states (DOS) is calculated. Symmetry analysis of the perturbation matrix shows that in the system with d-type electronic wave functions additional DOS of d-, p- and s-types appear due to the perturbation of local energy levels and the interaction between nearest neighbors around the vacancy. The local and resonant state formation caused by Zn impurities is analyzed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510070022
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  • 9
    Digitale Medien
    Digitale Medien
    Recursion method and one-hole spectral function of the Majumdar-Ghosh model (2003)
    Springer
    The European physical journal 35 (2003), S. 21-31 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. We consider the application of the recursion method to the calculation of one-particle Green’s functions for strongly correlated systems and propose a new way how to extract the information about the infinite system from the exact diagonalisation of small clusters. Comparing the results for several cluster sizes allows us to establish those Lanczos coefficients that are not affected by the finite size effects and provide the information about the Green’s function of the macroscopic system. The analysis of this ‘bulk-related’ subset of coefficients supplemented by alternative analytic approaches allows to infer their asymptotic behaviour and to propose an approximate analytical form for the ‘terminator’ of the Green’s function continued fraction expansion for the infinite system. As a result, the Green’s function acquires the branch cut singularity corresponding to the incoherent part of the spectrum. The method is applied to the spectral function of one-hole in the Majumdar-Ghosh model (the one-dimensional $ t-J-J^{\prime}$ model at $J^{\prime }/J=1/2$ ). For this model, the branch cut starts at finite energy $\omega_0$ , but there is no upper bound of the spectrum, corresponding to a linear increase of the recursion coefficients. Further characteristics of the spectral function are band gaps in the middle of the band and bound states below $\omega_0$ or within the gaps. The band gaps arise due to the period doubling of the unit cell and show up as characteristic oscillations of the recursion coefficients on top of the linear increase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00252-x
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  • 10
    Digitale Medien
    Digitale Medien
    Effective equations for disordered one-dimensional systems (1987)
    Springer
    The European physical journal 67 (1987), S. 169-177 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Using the method of supersymmetry, effective equations are derived for the one-particle Green's function of various one-dimensional disordered models. As an example, explicit expressions for the density of states and the localization length are derived for the two-band model of a one-dimensional semiconductor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01303977
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