# Rectifying full-counting statistics in a spin Seebeck engine

## TL;DR

This paper explores the rectification and negative differential effects in the full-counting statistics of thermal spin transport within a spin Seebeck engine, revealing quantum fluctuation effects at the electron/magnon interface.

## Contribution

It formulates the scaled cumulant generating function for the system using nonequilibrium Green's functions, highlighting the role of quantum dot-induced fluctuations.

## Key findings

- Identification of rectification effects in spin transport.
- Observation of negative differential conductance phenomena.
- Quantum fluctuations significantly influence transport properties.

## Abstract

We investigate the rectification and negative differential effects of full-counting statistics of conjugate thermal spin transport in a spin Seebeck engine. The engine is made by an electron/magnon interface diode driven by a temperature bias, of which the scaled cumulant generating function is formulated in the framework of nonequilibrium Green's function. The strongly fluctuating interfacial electron density of states induced by quantum dot is responsible for these intriguing properties. This work is relevant for designing efficient spin caloritronic engine and can broaden our view in nonequilibrium thermodynamics and the nonlinear phenomenon in quantum transport system.