Tunneling in quantum wires: Exact solution of the spin isotropic case

Article

关键词: KONDO PROBLEM;    FIELD-THEORY;    SIGMA-MODELS;    S-MATRICES;    SYSTEMS;    POINT;    STATE;   

DOI  :  10.1103/PhysRevB.56.7598

来源: SCIE

【 摘 要 】

We show that the problem of impurity tunneling in a Luttinger liquid of electrons with spin is solvable in the spin isotropic case (g(sigma)=2, g(rho) arbitrary). The resulting integrable model is similar to a two-channel anisotropic Kondo model, but with the impurity spin in a ''cyclic representation'' of the quantum algebra su(2)(q) associated with the anisotropy. Using exact, nonperturbative techniques we study the renormalization-group flow, and compute the de conductance. As expected from the analysis of Kane and Fisher we find that the LR fixed point corresponds to two separate leads. We also prove an exact duality between the UV and IR expansions of the current at vanishing temperature.

【 授权许可】

Free