Giant spin thermoelectric efficiency in ferromagnetic graphene nanoribbons with antidots

Wierzbicki, M.; Świrkowicz, R.; Barnaś, J.

doi:10.1103/physrevb.88.235434

Cited by 54 publications

(24 citation statements)

References 69 publications

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“…The efficiency can be also enhanced by randomly distributed hydrogen vacancies in almost completely hydrogenated GNRs 11 . Furthermore, structural defects, especially in the form of antidots, also appear a promising way to enhance thermoelectric efficiency [12][13][14] . Indeed, giant spin related thermoelectric phenomena have been predicted for ferromagnetic zGNRs with antidots 14 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons terminated with hydrogen atoms

Zberecki

Świrkowicz

Wierzbicki

et al. 2014

Phys. Chem. Chem. Phys.

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Using ab initio methods we calculate thermoelectric and spin thermoelectric properties of silicene nanoribbons with bare, mono-hydrogenated and di-hydrogenated edges. Asymmetric structures, in which one edge is either bare or di-hydrogenated while the other edge is mono-hydrogenated (0H-1H and 2H-1H nanoribbons), have a ferromagnetic ground state and display remarkable conventional and spin thermoelectric properties. Strong enhancement of the thermoelectric efficiency, both conventional and spin ones, results from a very specific band structure of such nanoribbons, where one spin channel is blocked due to an energy gap while the other spin channel is highly conductive. In turn, 0H-2H and 2H-2H nanoribbons (with one edge being either bare or di-hydrogenated and the other edge being di-hydrogenated) are antiferromagnetic in the ground state. Accordingly, the corresponding spin channels are equivalent, and only conventional thermoelectric effects can occur in these nanoribbons.

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Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons terminated with hydrogen atoms

Zberecki

Świrkowicz

Wierzbicki

et al. 2014

Phys. Chem. Chem. Phys.

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“…In the linear response regime, the electric and the heat currents in the spin channel, σ(=↑, ↓) , are respectively obtained by [52][53][54] , and…”

Section: Calculation Methods and Simulation Modelmentioning

confidence: 99%

“…In the linear response regime, the electric and the heat currents in the spin channel, , are respectively obtained by 52 – 54 , and where is the Lorentz function and is the Fermi–Dirac distribution function of the electrode with chemical potential of at T temperature. The spin-dependent transmission coefficient, obtained by TRANSIESTA code 55 is given by: where as the broadening matrix is equal to the anti-Hermitian part of the self-energy, and is the self-energy describing the contact between left (right) electrode and the molecule, which depends on the electrodes surface Green’s function, , and coupling matrix, .…”

Section: Calculation Methods and Simulation Modelmentioning

confidence: 99%

The impact of Fe atom on the spin-filter and spin thermoelectric properties of Au-Fe@C20-Au monomer and dimer systems

Khalatbari

Vishkayi

Soleimani

2020

Sci Rep

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Based on density functional theory and non-equilibrium Green’s function formalism, we explore the effect of Fe atom in Au-Fe@C20-Au monomer and dimer systems in comparison with the C20 fullerene molecular junctions. We calculate the spin-dependent transmission coefficient, spin polarization and also their spin thermoelectric coefficients to investigate magnetic properties in the system. Our results indicate that the presence of Fe atoms enhances substantially the spin-filter and increases the spin figure of merit in the dimer system. We suggest that the Au-(Fe@C20)2-Au system is a suitable junction for designing spin-filtering and spin thermoelectric devices and eventually it is a good candidate for spintronic applications.

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“…Indeed, such an effect was observed experimentally in thin films 44,45 and tunnel junctions, 46,47 and was also studied theoretically in transport through other nanoscale systems. 23,24,48,49 It is also worth to note that thermoelectric properties of magnetic multilayered structures remarkably depend on relative alignment of magnetizations in neighboring magnetic layers 50 .…”

Section: Introductionmentioning

confidence: 99%

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

Trocha

Barnaś

2017

Phys. Rev. B

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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. System with ferromagnetic and superconducting leads can also reveal spin thermoelectric phenomena. 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 like approximation with respect to the intradot Coulomb interaction.

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Giant spin thermoelectric efficiency in ferromagnetic graphene nanoribbons with antidots

Cited by 54 publications

References 69 publications

Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons terminated with hydrogen atoms

Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons terminated with hydrogen atoms

The impact of Fe atom on the spin-filter and spin thermoelectric properties of Au-Fe@C20-Au monomer and dimer systems

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

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