A polaron theory of quantum thermal transistor in nonequilibrium three-level systems
Wang Chen1, †, Xu Da-Zhi2, ‡
       

Heat amplification factor as a function of system–middle bath coupling strength αm in low (Tl = 0.5, Tr = 0.4) and high (Tl = 2, Tr = 0.4) temperature bias regimes, with maxTr<Tm<Tl{βr} the maximal value of βr by tuning the temperature of the middle bath Tm between Tr and Tl. The other parameters are given by εl = 1.0, εr = 0.6, Δ = 0.6, γ = 0.0002, and ωc = 10.