Polar plots of (a) the efficiency η(θ) in units of Carnot efficiency ηC [Eq. (15)] and (b) power W(θ) [Eq. (16)] as a function of the parameter θ. At θ = 0 or π, the values of η(θ) and W(θ) recover those for the L-R thermoelectric effect (red dots). While at θ = π/2 or 3π/2, they go back to the values of the P-R thermoelectric effect (blue dots). The parameters are t = −0.2kBT, Γ = 0.5kBT, μ = 0, E1 = 1.0kBT, E2 = 2.0kBT, and E3 = 1.0kBT. |