Nanomeghyas

Nanomeghyas

Investigation of Electronic, Spintronic, and Thermoelectric Properties in a Graphene Nanoribbon-Constrained Benzene Molecule in the presence of ferromagnetic substrate

Document Type : Original Article

Authors
1 Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran
2 Department of Physics Education, Farhangian University, P.O. Box 14665-889, Tehran, Iran
3 Physics Department, Islamic Azad University, Dezful Branch, Khoozestan
Abstract
In this research, we investigate and study the electronic, spintronic, and thermoelectric properties of a benzene molecule and two triangular graphene flakes confined between two semi-infinite graphene nanoribbons. We assume that the presence of a ferromagnetic sublayer in the middle of the structure induces an exchange potential, which in turn affects electron conductance by breaking the spin degeneracy between different spin states. We assume no bias potential is applied between the two ends of the sample; instead, a temperature difference of 20 K between the two ends of the structure generates a current. This article based on tight binding model focuses on the thermoelectric properties of this system, and the results show that the Seebeck coefficient for both spin states will have a significant value. The Seebeck coefficient for electrons with up and down spins differs from each other, and it exhibits a significant increase for the down spin state compared to a case with no exchange potential. It is observed that the spin-dependent electrical current ranges from one to two nanoamperes for the up-spin state and from seven to eight nanoamperes for the down spin state, while without the presence of the exchange potential, the current would be much weaker.
Keywords
Subjects

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  • Receive Date 05 December 2023
  • Revise Date 05 January 2024
  • Accept Date 27 January 2024