Mapping of the Anisotropic Two-channel Anderson Model onto a Fermi-Majorana bi-Resonant Level Model

TL;DR

This paper maps an extended two-channel Anderson model onto a bi-resonant level model, revealing non-Fermi liquid behavior at low temperatures and providing exact calculations of entropy and impurity occupation.

Contribution

It establishes a precise correspondence between the two models and analyzes the model's behavior, including its fixed points and physical energy scales.

Findings

Model becomes quadratic for certain parameters

Entropy and impurity occupation calculated in closed form

Model approaches a non-Fermi liquid fixed point at zero temperature

Abstract

We establish the correspondence between an extended version of the two-channel Anderson model and a particular type of bi-resonant level model. For certain values of the parameters the new model becomes quadratic. We calculate in closed form the entropy and impurity occupation as functions of temperature and identify the different physical energy scales of the problem. We show how, as the temperature goes to zero, the model approaches a universal line of fixed points non-Fermi liquid in nature.