Full Counting Statistics with Spin-sensitive Detectors reveals Spin-singlets

TL;DR

This paper investigates the full counting statistics of spin-dependent electron transport, revealing that a significant portion of charge transfer occurs via spin-singlet pairs, especially in high-transparency channels.

Contribution

It introduces a method to interpret charge transfer statistics in terms of single electrons and spin-singlet pairs in spin-sensitive detectors.

Findings

Charge transfer can be described by single electrons and spin-singlet pairs.

High transparency channels increase the fraction of spin-singlet pairs.

Spin-sensitive detectors reveal the presence of spin-singlet correlations.

Abstract

We study the full counting statistics of electric current to several drain terminals with spin-dependent entrance conductances. We show that the statistics of charge transfers can be interpreted in terms of single electrons and spin-singlet pairs coming from the source. If the source contains transport channels of high transparency, a significant fraction of electrons comes in spin-singlet pairs.