Thermoelectric performance of nano junctions subjected to microwave driven spin-orbit coupling (2403.10264v1)
Abstract: Coherent charge and heat transport through periodically driven nanodevices provide a platform for studying thermoelectric effects on the nanoscale. Here we study a junction comprising a quantum dot connected to two fermionic terminals by two weak links. An AC electric field induces time-dependent spin-orbit interaction in the weak links. We show that this setup supports DC charge and heat currents and that thermoelectric performance can be improved, as reflected by the effect of the spin-orbit coupling on the Seebeck coefficient and the electronic thermal conductance. Our analysis is based on the nonequilibrium Keldysh Green's function formalism in the time domain and reveals an interesting distribution of the power supply from the AC source among the various components of the device, apparently not realized before.
- This simple form of the AC phase factor is strictly justified only up to quadratic order in ksodsubscript𝑘so𝑑k_{\rm so}ditalic_k start_POSTSUBSCRIPT roman_so end_POSTSUBSCRIPT italic_d. Therefore our results are limited to ksod≪1much-less-thansubscript𝑘so𝑑1k_{\rm so}d\ll 1italic_k start_POSTSUBSCRIPT roman_so end_POSTSUBSCRIPT italic_d ≪ 1.
- The detailed derivation omits the electronic charge e𝑒eitalic_e from the definition of the charge current, which is then referred to as ‘particle current’ (or flux).
- The assumption of equal weak-link lengths obliterates the possibility of DC particles and energy currents when the two terminals are held at equal temperatures and equal chemical potentials OEW2020 .
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