Coherent effects in magneto-transport through Zeeman split levels

TL;DR

This paper investigates how quantum interference affects noise spectra in magneto-transport through quantum dots with Zeeman splitting, revealing characteristic peaks or dips at specific frequencies.

Contribution

It introduces a rate equation approach to analyze noise spectra, highlighting the role of quantum interference in non-equilibrium transport through Zeeman-split levels.

Findings

Spectral peaks or dips occur at Zeeman splitting frequencies due to quantum interference.

The analysis covers both noninteracting electrons and Coulomb blockade regimes.

Quantum interference significantly influences noise characteristics in magneto-transport.

Abstract

We study non-equilibrium electronic transport through a quantum dot or impurity weakly coupled to ferromagnetic leads. Based on the rate equation formalism we derive noise spectra for the transport current. We show that due to quantum interference between different spin components of the current the spectrum develops a peak or a dip at the frequency corresponding to Zeeman splitting in the quantum dot. The detailed analysis of the spectral structure of the current is carried out for noninteracting electrons as well as in the regime of Coulomb blockade.