| Abstract: | 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 φ
R
.
With increasing φ
R
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. |
