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  • Time-dependent thermoelectric transport in nanosystems [Elektronski vir] : reflectionless Luttinger field approach
    Lozej, Črt ; Rejec, Tomaž
    Recently the Luttinger field approach was proposed by Eich et al. in Phys. Rev. B 90, 115116 (2014). as a way to simulate switching on a temperature gradient across a nanoscale device initially in ... thermal equilibrium. The time-dependent particle and heat currents can then be calculated by propagating the initial equilibrium state of the system in time. Unfortunately, applying a uniform Luttinger field in the whole of a lead causes a discrepancy between steady-state currents in the long time limit and those predicted by the Landauer-Büttiker formulas as well as artifacts at short times. Here we propose a modified approach where the Luttinger field gradually reaches its final value across a transition region. If the length of the transition region is sufficient, the electrons move through without reflecting. In this way the correct energy distribution of electrons originating from such a lead, corresponding to the new temperature, is established in the scattering region. Our approach is tested on a single quantum dot and a parallel double quantum dot system.
    Vir: Physical review. B. [Elektronski vir]. - ISSN 2469-9969 (Vol. 98, issue 7, 2018, str. 075427-1-075427-10)
    Vrsta gradiva - e-članek
    Leto - 2018
    Jezik - angleški
    COBISS.SI-ID - 95102721