Mesoscopic Transport of Entangled and Nonentangled Kondo Singlets under Bias

TL;DR

This paper investigates mesoscopic transport phenomena of entangled and nonentangled Kondo singlets under bias, revealing distinct unidirectional and resonant tunneling behaviors that deviate from linear response theory.

Contribution

It introduces a detailed analysis of coherent transport mechanisms for entangled and nonentangled Kondo singlets, comparing theoretical models with experimental tunneling conductance data.

Findings

Entangled Kondo singlet spins flow unidirectionally in a sequential manner.

Nonentangled Kondo singlet exhibits resonant tunneling with coherent side peaks.

Transport behaviors deviate from linear response theory.

Abstract

The tunneling conductances of a quantum point contact and a magnetized atom adsorbed on an insulating layer above a metallic substrate are obtained by considering the coherent transport of the entangled and nonentangled Kondo singlets, and these are compared with the experimental results. Spins of the entangled Kondo singlet flow unidirectionally in a sequential up-and-down manner. This transport does not follow linear response theory. The nonentangled Kondo singlet performs resonant tunneling through a coherent transport channel and yields coherent side peaks at a finite bias. The coherent transport channel is formed by two electron reservoirs within a coherent region.