Parity-dependent Kondo effect in ultrasmall metallic grains

TL;DR

This paper investigates how the Kondo effect in ultrasmall metallic grains varies with electron number parity, using simulations and models to suggest experimental probing methods.

Contribution

It introduces a parity-dependent analysis of the Kondo effect in small metallic grains, combining quantum Monte Carlo simulations and analytic solutions.

Findings

Susceptibility behavior differs for even and odd electron counts

Parity affects the Kondo screening process

Proposes susceptibility measurement as a parity probe

Abstract

We study the Kondo effect in an ultrasmall metallic grain, i.e. small enough to have a discrete energy-level spectrum, by calculating the susceptibility chi of the magnetic impurity. Our quantum Monte Carlo simulations, and analytic solution of a simple model, show that the behavior changes dramatically depending on whether the number of electrons in the grain is even or odd. We suggest that the measurements of chi provide an effective experimental way of probing the grain's number parity.