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Spin Effects on Heat Current Through a Quantum Dot Attached to Ferromagnetic Leads

Authors
  • Ma, Jing-Min1
  • Chi, Feng2, 3
  • Xue, Hui-Jie4
  • 1 Bohai University, Center of laboratories, Jinzhou, 121013, China , Jinzhou (China)
  • 2 Inner Mongolia University, School of Physical Science and Technology, Huhehaote, 010023, China , Huhehaote (China)
  • 3 Bohai University, College of Engineering, Jinzhou, 121013, China , Jinzhou (China)
  • 4 Harbin Normal University, Heilongjiang Key Laboratory for Low Dimensional and Mesoscopic Physics, School of Physics and Electronic Engineering, Harbin, 150025, China , Harbin (China)
Type
Published Article
Journal
Journal of Low Temperature Physics
Publisher
Springer US
Publication Date
Feb 18, 2015
Volume
179
Issue
5-6
Pages
298–309
Identifiers
DOI: 10.1007/s10909-015-1281-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

A heat current originating from electron–phonon coupling in a quantum dot (QD) molecule connected to ferromagnetic leads is studied by the non-equilibrium Green’s function technique. The system is driven out of equilibrium by a temperature gradient (thermal bias) applied across the two terminals of the structure. We find that when the magnetic moments of the two leads are arranged in parallel configuration, the heat current is not sensitive to the leads’ ferromagnetism, whereas in the case of antiparallel configuration, the magnitude of the heat current increases with increasing spin polarization of the leads, with the reduction of the electric current’s intensity. We also find that the ferromagnetism on the leads can amplify the heat rectification effect occurring for some particular dot levels, i.e., the strength of the heat flowing between the QD and the phonon bath can be very small for one direction of the temperature gradient, while it becomes quite large when the corresponding direction of the temperature gradient is reversed.

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