Spin-dependent thermoelectric phenomena in a quantum dot attached to ferromagnetic and superconducting electrodes

Piotr Trocha and Józef Barnaś
Phys. Rev. B 95, 165439 – Published 21 April 2017

Abstract

We investigate transport and thermoelectric properties of hybrid systems based on a single-level quantum dot and one superconducting lead. The other lead is generally normal-metallic ferromagnet. In the latter case, single-particle transport is spin polarized. Our main interest is in the interplay of Andreev tunneling of Cooper pairs and single-particle tunneling. The latter is responsible for relatively large thermopower and figure of merit due to a diverging density of single-particle states at the superconducting gap edges. A system with ferromagnetic and superconducting leads can also reveal spin thermoelectric phenomena. A finite superconducting gap is considered within the BCS theory, and the thermoelectric coefficients are calculated by means of nonequilibrium Green's function technique within Hartree-Fock–type approximation with respect to the intradot Coulomb interaction.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 13 November 2016
  • Revised 25 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.165439

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Piotr Trocha1,* and Józef Barnaś1,2

  • 1Faculty of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland
  • 2Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland

  • *ptrocha@amu.edu.pl

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 16 — 15 April 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×