Heat current across double quantum dots in series coupled to ferromagnetic leads in antiparallel configuration within weak interdot coupling regime

• Published in: Journal of computational electronics Vol. 20; no. 6; pp. 2403 - 2410
• Main Authors: Najdi, M. A., AL-Mukh, J. M., Jassem, H. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2021; Springer Nature B.V
• Subjects: Configurations; Coupling; Electrical Engineering; Electrons; Energy; Energy levels; Engineering; Ferromagnetism; Green's functions; Heat; Magnetic moments; Mathematical and Computational Engineering; Mathematical and Computational Physics; Mechanical Engineering; Optical and Electronic Materials; Polarization (spin alignment); Quantum dots; Spin exchange; Temperature; Theoretical; Heat current; Double quantum dots; Spin–spin exchange interaction; Weak interdot coupling regime; Intradot Coulomb correlation
• ISSN: 1569-8025; 1572-8137
• DOI: 10.1007/s10825-021-01778-5

In this paper, we present the results obtained from our study on the heat current across double quantum dots in serial coupled to ferromagnetic leads (FM-DQDs-FM), when the leads magnetic moments are in antiparallel configuration. This study was done by using nonequilibrium Green's function method in the linear response regime. Our results are calculated in weak interdot coupling regime by taking all the parameters that affect the system such as intradot Coulomb correlation energy, spin–spin exchange interaction, and spin polarization on the leads. These results are accomplished as a function of temperature gradient as well as quantum dots energy levels. According to our results, it is noticed that the values of intradot Coulomb correlation energy and the spin–spin exchange interaction have significant impact on increasing the heat current that flows through our system. It is concluded that increasing or decreasing the magnitude of heat current in negative or positive thermal bias is ideal for designing high-efficiency heat diode.