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Fano-Rashba effect in thermoelectricity of a double quantum dot molecular junction

YS Liu1, XK Hong1, JF Feng1 and XF Yang12*

Author affiliations

1 Jiangsu Laboratory of Advanced Functional materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500, China

2 Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden

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Citation and License

Nanoscale Research Letters 2011, 6:618  doi:10.1186/1556-276X-6-618

Published: 7 December 2011

Abstract

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

Keywords:
Rashba spin-orbit interaction; Aharonov-Bohm interferometer; Quantum dots; Fano effects