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• W2005756048 abstract "The spin thermoelectric properties of a zigzag edged ferromagnetic (FM) graphene nanoribbon are studied theoretically by using the non-equilibrium Green's function method combined with the Landauer–Büttiker formula. By applying a temperature gradient along the ribbon, under closed boundary conditions, there is a spin voltage ΔVs inside the terminal as the response to the temperature difference ΔT between two terminals. Meanwhile, the heat current ΔQ is accompanied from the 'hot' terminal to the 'cold' terminal. The spin thermopower S = ΔVs/ΔT and thermoconductance κ = ΔQ/ΔT are obtained. When there is no magnetic field, S versus ER curves show peaks and valleys as a result of band selective transmission and Klein tunneling with ER being the on-site energy of the right terminal. The results are in agreement with the semi-classical Mott relation. When |ER| < M (M is the FM exchange split energy), κ is infinitesimal because tunneling is prohibited by the band selective rule. While |ER| > M, the quantized value of appears. In the quantum Hall regime, because Klein tunneling is suppressed, S peaks are eliminated and the quantized value of κ is much clearer. We also investigate how the thermoelectric properties are affected by temperature, FM exchange split energy and Anderson disorder. The results indicate that S and κ are sensitive to disorder. S is suppressed for even small disorder strengths. For small disorder strengths, κ is enhanced and for moderate disorder strengths, κ shows quantized values." @default.
• W2005756048 created "2016-06-24" @default.
• W2005756048 creator A5028467187 @default.
• W2005756048 date "2012-09-03" @default.
• W2005756048 modified "2023-09-27" @default.
• W2005756048 title "Spin thermopower and thermoconductance in a ferromagnetic graphene nanoribbon" @default.
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• W2005756048 doi "https://doi.org/10.1088/0953-8984/24/38/385302" @default.
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