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Time-dependent thermoelectric transport in nanosystems [Elektronski vir] : reflectionless Luttinger field approachLozej, Črt ; Rejec, TomažRecently 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.Source: Physical review. B. [Elektronski vir]. - ISSN 2469-9969 (Vol. 98, issue 7, 2018, str. 075427-1-075427-10)Type of material - e-articlePublish date - 2018Language - englishCOBISS.SI-ID - 95102721
Author
Lozej, Črt |
Rejec, Tomaž
Topics
thermal conductivity |
thermal properties |
thermoelectric effects |
transport properties |
quantum dots
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Lozej, Črt | 39083 |
Rejec, Tomaž | 19162 |
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