Dynamical Spin-Blockade in a quantum dot with paramagnetic leads

TL;DR

This paper explores how a magnetic field induces dynamical spin blockade in a three-terminal quantum dot, leading to enhanced shot noise and positive current correlations, with potential realization in semiconductor quantum dots.

Contribution

It demonstrates the occurrence of dynamical spin blockade and associated noise phenomena in a quantum dot system with paramagnetic leads, offering new insights into spin-dependent transport.

Findings

Super-Poissonian shot noise observed

Positive zero-frequency cross-correlations identified

Dynamical spin blockade induced by magnetic field

Abstract

We investigate current fluctuations in a three-terminal quantum dot in the sequential tunneling regime. Dynamical spin blockade can be induced when the spin-degeneracy of the dot states is lifted by a magnetic field. This results in super-Poissonian shot noise and positive zero-frequency cross-correlations. Our proposed setup can be realized with semiconductor quantum dots.