Spin-current rectification through a quantum dot using temperature bias

TL;DR

This paper investigates how temperature bias influences spin-dependent transport and polarization in a quantum dot spin-diode, revealing complex behaviors and the impact of spin-flip processes on current polarization.

Contribution

It introduces a detailed analysis of spin-current rectification in a quantum dot under temperature bias, highlighting the effects of spin-flip and lead temperature differences on spin transport.

Findings

Spin accumulation increases linearly with a warmer metallic electrode.

Spin-flip reduces current polarization significantly, up to 90%.

Behavior of spin-dependent current depends on temperature, spin-flip rate, and polarization.

Abstract

We analyze spin-dependent transport through a spin-diode in the presence of spin-flip and under influence of temperature bias. The current polarization and the spin accumulation are investigated in detail by means of reduced density matrix. Results show that the spin accumulation is linearly increased when the metallic electrode is warmer whereas, its behavior is more complicated when the ferromagnetic lead is warmer. Furthermore, spin-flip causes that the current polarization becomes not only a function of spin-flip rate but also a function of temperature. The current polarization is reduced up to 90% if the time of spin-flip is equal to the tunneling time. The behavior of spin-dependent current is also studied as a function of temperature, spin-flip rate, and polarization.