# Spin-Seebeck effect and spin polarization in a multiple quantum dot molecule

## TL;DR

This paper investigates the spin-dependent thermoelectric properties of a quantum dot molecule, demonstrating potential for efficient spin filtering and pure spin Seebeck effect generation under weak magnetic fields.

## Contribution

It introduces a novel quantum dot molecule setup that enables tunable spin Seebeck effects and efficient spin filtering, even with weak magnetic fields.

## Key findings

- Enhanced Seebeck coefficient due to energy level asymmetry
- Pure spin Seebeck effect achievable at fixed quantum dot levels
- Potential for spin-based energy conversion devices

## Abstract

In this work, we study the conductance and the thermoelectric properties of a quantum dot embedded between two metallic leads with a side-coupled triple quantum dot molecule under a magnetic field. We focus on the spin polarization and thermoelectric quantities. Our results show the possibility of design an efficient spin filter device besides a noticeable enhancement of the Seebeck coefficient driven by the asymmetry in the quantum dots energy levels and a tunable pure spin Seebeck effect is obtained. This behavior also holds in the interacting case, where a pure spin Seebeck effect can be obtained for fixed values of the embedded quantum dot energy level. Our findings could lead to the implementation of a new pure spin energy conversion and capable spin filter devices working with weak magnetic fields.