Thermoelectric efficiency enhanced in a quantum dot with polarization leads, spin-flip and external magnetic field

We theoretically study the thermoelectric transport properties in a quantum dot system with two ferromagnetic leads, the spin-flip scattering and the external magnetic field. The results show that the spin polarization of the leads strongly influences thermoelectric coefficients of the device. For t...

Full description

Saved in:
Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2018-03, Vol.91 (3), p.1-7, Article 57
Main Authors: Yao, Hui, Niu, Peng-Bin, Zhang, Chao, Xu, Wei-Ping, Li, Zhi-Jian, Nie, Yi-Hang
Format: Article
Language:English
Subjects:
Complex Systems
Condensed Matter Physics
Configurations
Efficiency
Ferromagnetism
Figure of merit
Fluid- and Aerodynamics
Magnetic fields
Magnetic properties
Merit increases
Physics
Physics and Astronomy
Polarization
Polarization (spin alignment)
Quantum dots
Regular Article
Scattering
Solid State Physics
Thermoelectricity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We theoretically study the thermoelectric transport properties in a quantum dot system with two ferromagnetic leads, the spin-flip scattering and the external magnetic field. The results show that the spin polarization of the leads strongly influences thermoelectric coefficients of the device. For the parallel configuration the peak of figure of merit increases with the increase of polarization strength and non-collinear configuration trends to destroy the improvement of figure of merit induced by lead polarization. While the modulation of the spin-flip scattering on the figure of merit is effective only in the absence of external magnetic field or small magnetic field. In terms of improving the thermoelectric efficiency, the external magnetic field plays a more important role than spin-flip scattering. The thermoelectric efficiency can be significantly enhanced by the magnetic field for a given spin-flip scattering strength.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2018-80552-8