Surprises in the phase diagram of an Anderson impurity model for a single C$_{60}^{n-}$ molecule

TL;DR

This paper reveals a complex phase diagram for a three-orbital Anderson impurity model of C$_{60}^{n-}$, showing non-Fermi-liquid behavior and high doping sensitivity, with implications for molecular electronics.

Contribution

It introduces a detailed analysis of the phase diagram of a three-orbital Anderson impurity model for C$_{60}^{n-}$ using Wilson NRG and conformal field theory, highlighting novel non-Fermi-liquid fixed points.

Findings

Identification of stable and unstable non-Fermi-liquid fixed points

High sensitivity of the phase diagram to doping levels

Implications for conductance in C$_{60}$-based transistors

Abstract

We find by Wilson numerical renormalization group and conformal field theory that a three-orbital Anderson impurity model for a C$_{60}^{n-}$ molecule has a very rich phase diagram which includes non-Fermi-liquid stable and unstable fixed points with interesting properties, most notably high sensitivity to doping $n$. We discuss the implications of our results to the conductance behavior of C$_{60}$-based single-molecule transistor devices.