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  • 1990-1994  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Quantum Monte Carlo simulation of the dynamics of the spin-boson model (1992)
    Springer
    The European physical journal 89 (1992), S. 97-107 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper presents the results of stationary-phase Monte Carlo simulations for the dynamics of the spin-boson problem. The problem of alternating weights ubiquitous in dynamical simulations has been solved using discretized path-integral simulations in conjunction with stationary-phase filtering techniques. Our computation covers the bulk of the parameter space, including non-zero bias and frequency-dependent dissipation. Besides a comparison with analytic predictions, we present some new results. For sub-Ohmic dissipation, the dynamics at low temperatures depends significantly on the initial preparation. In the Ohmic regime 1/2〈K〈1, whereK is Kondo's dimensionless coupling strength, we find significant deviations from the predictions of the non-interacting blip approximation at long times and low temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01320834
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  • 2
    Digitale Medien
    Digitale Medien
    Nonlinear transport properties of quantum dots (1994)
    Springer
    The European physical journal 96 (1994), S. 201-206 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 72.20.Ht ; 73.20.Dx ; 73.20.Mf ; 73.40.Gk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The influence of excited levels on nonlinear transport properties of a quantum dot weakly coupled to leads is studied using a master-equation approach. A charging model for the dot is compared with a quantum mechanical model for interacting electrons. The currentvoltage curve shows Coulomb lockade and additional finestructure that is related to the excited states of the correlated electrons. Unequal coupling to the leads causes asymmetric conductance peaks. Negative differential conductances are predicted due to the existence of excited states with different spins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01313284
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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