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Fano-Rashba effect in thermoelectricity of a double quantum dot molecular junction
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
2011 (English)In: Nanoscale Research Letters, ISSN 1931-7573, Vol. 6, 618- p.Article in journal (Refereed) Published
Abstract [en]

We examine the relation between the phase-coherent processes and spin-dependent thermoelectric effects in an Aharonov-Bohm (AB) interferometer with a Rashba quantum dot (QD) in each of its arm by using the Green's function formalism and equation of motion (EOM) technique. Due to the interplay between quantum destructive interference and Rashba spin-orbit interaction (RSOI) in each QD, an asymmetrical transmission node splits into two spin-dependent asymmetrical transmission nodes in the transmission spectrum and, as a consequence, results in the enhancement of the spin-dependent thermoelectric effects near the spin-dependent asymmetrical transmission nodes. We also examine the evolution of spin-dependent thermoelectric effects from a symmetrical parallel geometry to a configuration in series. It is found that the spin-dependent thermoelectric effects can be enhanced by controlling the dot-electrode coupling strength. The simple analytical expressions are also derived to support our numerical results.PACS numbers: 73.63.Kv; 71.70.Ej; 72.20.Pa

Place, publisher, year, edition, pages
2011. Vol. 6, 618- p.
Keyword [en]
Rashba spin-orbit interaction, Aharonov-Bohm interferometer, Quantum dots, Fano effects
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-83798DOI: 10.1186/1556-276X-6-618ISI: 000299164900001ScopusID: 2-s2.0-84862972701OAI: diva2:501313
QC 20120214Available from: 2012-02-14 Created: 2012-02-13 Last updated: 2012-02-14Bibliographically approved

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