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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of tunneling through molecules with Mott-Hubbard and with dimerization gaps (1998)
    Springer
    The European physical journal 2 (1998), S. 293-299 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.40.Gk Tunneling - 73.61.Ph Polymers; organic compounds - 61.16.Ch Scanning probe microscopy; scanning tunneling, atomic force, scanning optical, magnetic force, etc.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In order to study the tunneling of electrons through an interacting, 1D, dimerized molecule connected to leads, we consider the persistent current in a ring embedding this molecule. We find numerically that, for spinless fermions, a molecule with a gap mostly due to interactions, i.e. a Mott-Hubbard gap, gives rise to a larger persistent current than a molecule with the same gap, but due only to the dimerization. In both cases, the tunneling current decreases exponentially with the size of the molecule, but more slowly in the interacting case. Implications for molecular electronic are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050252
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical conductivity of the Bechgaard salts: the sum rules revisited (1998)
    Springer
    The European physical journal 3 (1998), S. 149-154 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 78.20.-e Optical properties of bulk materials and thin films - 75.30.Fv Spin-density waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The validity of the optical sum rules has been addressed eversince and was always matter of debate. Particularly controversial is the proof that the partial sum rules can be extended to both optical conductivity and energy loss function. We show in this paper that for both transverse (optical conductivity) and longitudinal (energy loss function) absorption processes the corresponding sum rule can be theoretically established and through appropriate conditions for the integration limits exactly verified. We also focus our attention on the one-dimensional case within the microscopic Hubbard model. An application of these concepts to the quasi one-dimensional systems, for which we have chosen the organic (TMTSF)2PF6 material, will also be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050295
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ladders in a magnetic field: a strong coupling approach (1998)
    Springer
    The European physical journal 6 (1998), S. 201-205 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Jm Quantized spin models - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) - 75.50.Ee Antiferromagnetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We show that non-frustrated and frustrated ladders in a magnetic field can be systematically mapped onto an XXZ Heisenberg model in a longitudinal magnetic field in the limit where the rung coupling is the dominant one. This mapping is valid in the critical region where the magnetization goes from zero to saturation. It allows one to relate the properties of the critical phase (H c 1, H c 2, the critical exponents) to the exchange integrals and provide quantitative estimates of the frustration needed to create a plateau at half the saturation value for different models of frustration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050542
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    Paper (German National Licenses)
    Fulltext
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