Equilibrium dynamics of the sub-Ohmic spin-boson model under bias
Zheng Da-Chuan, Tong Ning-Hua †
       

(color online) Checking the Shiba relation at s = 0.8 and Δ = 0.1. C(ω) (empty symbols) is compared to (solid symbols) for various α and ε values. Here . NRG parameters are , , and .