Pure spin thermoelectric generator based on a rashba quantum dot molecule

Abstract

Enhanced spin figure of merit in a Rashba quantum dot ring connected to ferromagnetic leadsWe propose a pure thermoelectric spin generator based on a Rashba quantum dot molecular junction by using the temperature difference instead of the usual voltage bias difference. A magnetic flux penetrating through the device is also considered. The spin Seebeck coefficient S S and the spin figure of merit Z S T of the molecular junction are calculated in terms of the Green's function formalism and the equation of motion (EOM) technique. It is found that a pure spin-up (spin-down) Seebeck coefficient can be generated by the coaction of the magnetic flux and the Rashba spin-orbit (RSO) interaction.

Fano-Rashba effect in thermoelectricity of a double quantum dot molecular junction

“…So the magnitude of the magnetic field B is 16.4 mT when ϕ = 2 π . In the absence of the RSOI, the work will come back to the previous work [24], in which a 2 π -periodic linear conductance is obtained, and it is in good agreement with the experimental work [1]. φ R denotes the difference between φ R 1 and φ R 2 , where φ Ri is the phase factor induced by the RSOI inside the ith QD.…”

A single-spin-current thermal generator

“…We thus can write the spin-down current into the 2nd electrode within a two-terminal current formula, Though Eq. (14) has no strict analytical solutions, we still can capture main information in the linear response region by a proper approximation. After expanding the Fermi-Dirac distribution function to the first order in 4T, we have…”

“…12 These experimental works provide a powerful basis for designing and fabricating new-style spin-dependent thermoelectric devices. [13][14][15][16][17][18][19][20][21][22] This new subject is then called "thermo-spintronics." Due to the phase locking effect in the absence of magnetic field or magnetic materials, it is very difficult to generate spin-polarized currents in two-terminal devices.…”

Tunable half-metallic properties and spin Seebeck effects in zigzag-edged graphene nanoribbons adsorbed with V atom or V-benzene compound

“…Benefiting from the rapid developments of the spin-detection techniques, the spin voltage induced by a temperature gradient has been successfully measured in a metallic magnet [19]. Until now, this pioneering experiment has inspired a great deal of theoretical and experimental studies of the spin-dependent thermoelectric effects in various systems [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”