Effect of assisted hopping on the formation of local moments in magnetic impurities and quantum dots

TL;DR

This paper investigates how assisted hopping influences local moment formation and conductance in magnetic impurities and quantum dots, revealing its comparable magnitude to electron-electron interactions and its role in inducing local pairing correlations.

Contribution

It provides a detailed analysis of assisted hopping effects in quantum dots, highlighting their significance and impact on conductance and pairing phenomena.

Findings

Assisted hopping magnitude is comparable to electron-electron interaction corrections.

Assisted hopping causes differences between conductance peaks for the same level.

Strong assisted hopping can induce local pairing correlations.

Abstract

Assisted hopping effects in magnetic impurities and quantum dots are analyzed. The magnitude of the assisted hopping term in a quantum dot in the limit of large level spacing is comparable to other corrections induced by the electron-electron interactions. Assisted hopping leads to differences between conductance peaks associated to the same level, and, when the effect is sufficiently strong, to local pairing correlations.