Thermoelectric effects in a double-dot Aharonov-Bohm interferometer with Rashba spin-orbit interaction
College of Science, Nanjing University of Aeronautics and Astronautics, Jiangsu, 210016, P.R. China
Corresponding author: a email@example.com
Revised: 29 May 2011
Published online: 14 July 2011
We investigate the thermoelectric effects in a double-dot Aharonov-Bohm interferometer coupled to ferromagnetic leads held at different temperatures. The interplay of Rashba spin-orbit interaction (RSOI) and magnetic flux ϕ induces various interesting spin-dependent interference phenomena. The thermoelectric transport oscillates with ϕ. The peak of the thermopower S and figure of merit ZT splits into two new peaks and its splitting increases with the Rashba induced phase factor φR. With increasing φR S and ZT at ϕ = ± 2nπ (n = 0,1,2,...) exhibit a conversion from a peak to a valley. In the presence of the interplay of RSOI and ϕ by increasing spin polarization the splitting peaks of S (ZT) become asymmetric and ZT is greatly enhanced. The influence of the quantum dot levels on thermoelectric effects is also analyzed.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011