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

(a) The globally cyclic transition contributed by the Gl±Gm±Gr/A , and the locally conditional transitions contributed by (b) GmGl+Gl/A , (c) Gm+Gr+Gr/A , (d) GrGl+Gl/A , and (e) GlGr+Gr/A within the nonequilibrium NIBA scheme, respectively. The horizontal solid black line at top represents |0〉; two horizontal solid black lines at bottom describe renormalized energy levels |l(r)〉 with the energies El(r) = εl(r)Σk|gk,m|2/ωk. The other symbols are the same as those in Fig. 1.