Quantum dot as spin current generator and energy harvester

Szukiewicz, Barbara; Wysokiński, K. I.

doi:10.1140/epjb/e2015-60156-8

Cited by 13 publications

(17 citation statements)

References 79 publications

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“…A similar model with ferromagnetic leads is treated in Ref. [384], but we will restrict ourselves to non-magnetic reservoirs. Then the rate equation is…”

Section: Including Spin and Double-occupancymentioning

confidence: 99%

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Fundamental aspects of steady-state conversion of heat to work at the nanoscale

et al. 2017

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In recent years, the study of heat to work conversion has been re-invigorated by nanotechnology. Steady-state devices do this conversion without any macroscopic moving parts, through steady-state flows of microscopic particles such as electrons, photons, phonons, etc. This review aims to introduce some of the theories used to describe these steady-state flows in a variety of mesoscopic or nanoscale systems. These theories are introduced in the context of idealized machines which convert heat into electrical power (heat-engines) or convert electrical power into a heat flow (refrigerators). In this sense, the machines could be categorized as thermoelectrics, although this should be understood to include photovoltaics when the heat source is the sun. As quantum mechanics is important for most such machines, they fall into the field of quantum thermodynamics. In many cases, the machines we consider have few degrees of freedom, however the reservoirs of heat and work that they interact with are assumed to be macroscopic. This review discusses different theories which can take into account different aspects of mesoscopic and nanoscale physics, such as coherent quantum transport, magnetic-field induced effects (including topological ones such as the quantum Hall effect), and single electron charging effects. It discusses the efficiency of thermoelectric conversion, and the thermoelectric figure of merit. More specifically, the theories presented are (i) linear response theory with or without magnetic fields, (ii) Landauer scattering theory in the linear response regime and far from equilibrium, (iii) Green-Kubo formula for strongly interacting systems within the linear response regime, (iv) rate equation analysis for small quantum machines with or without interaction effects, (v) stochastic thermodynamic for fluctuating small systems. In all cases, we place particular emphasis on the fundamental questions about the bounds on ideal machines. Can magnetic-fields change the bounds on power or efficiency? What is the relationship between quantum theories of transport and the laws of thermodynamics? Does quantum mechanics place fundamental bounds on heat to work conversion which are absent in the thermodynamics of classical systems?

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“…A similar model with ferromagnetic leads is treated in Ref. [384], but we will restrict ourselves to non-magnetic reservoirs. Then the rate equation is…”

Section: Including Spin and Double-occupancymentioning

confidence: 99%

“…The above results, Eqs. (379)(380)(381)(382)(383)(384), constitute a complete solution of the general case of this model. Returning to the special case discussed in detail above, given by Eq.…”

Section: Solving the Steady-state Equationmentioning

confidence: 99%

Fundamental aspects of steady-state conversion of heat to work at the nanoscale

et al. 2017

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“…54 It is shown that an efficient pure-spin-current injection can be used to realize the magnetization switching of a nano-scale ferromagnetic particle and measurements of room temperature spin Hall effect as well. 36,55,56 The thermoelectric transport through quantum dots [57][58][59][60] and magnetic molecules [61][62][63][64] can generate pure spin current in electrodes. It is demonstrated that the device supporting a spin current is also possible to be adopted as an energy harvester.…”

Section: Introductionmentioning

confidence: 99%

“…It is demonstrated that the device supporting a spin current is also possible to be adopted as an energy harvester. 60 Optimum conditions are realized to achieve maximum of pure spin current in the thermoelectric transport device. 65 More interestingly, it is much easier to generate highly spin-polarized and pure spin currents with a SMM attached to two normal metal electrodes in the presence of a temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

“…However, the higher Coulomb repulsion of transport electrons strongly diminishes the maximal efficiency of the device. 60,65 It is thus of a great interest to propose a scheme for compensation of the interaction induced suppression of the device efficiency. To this end we in this paper study the effect of an external magnetic field on the thermoelectric transport through a SMM in the existence of Coulomb repulsion of transport electrons.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

et al. 2018

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In this work, we study the generation of spin-current in a single-molecule magnet (SMM) tunnel junction with Coulomb interaction of transport electrons and external magnetic field. In the absence of field the spin-up and -down currents are symmetric with respect to the initial polarizations of molecule. The existence of magnetic field breaks the time-reversal symmetry, which leads to unsymmetrical spin currents of parallel and antiparallel polarizations. Both the amplitude and polarization direction of spin current can be controlled by the applied magnetic field. Particularly when the magnetic field increases to a certain value the spin-current with antiparallel polarization is reversed along with the magnetization reversal of the SMM. The two-electron occupation indeed enhances the transport current compared with the single-electron process. However the increase of Coulomb interaction results in the suppression of spin-current amplitude at the electron-hole symmetry point. We propose a scheme to compensate the suppression with the magnetic field.

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Spin-thermoelectric effects in a quantum dot hybrid system with magnetic insulator

Trocha

Siuda

2022

Sci Rep

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We investigate spin thermoelectric properties of a hybrid system consisting of a single-level quantum dot attached to magnetic insulator and metal electrodes. Magnetic insulator is assumed to be of ferromagnetic type and is a source of magnons, whereas metallic lead is reservoir of electrons. The temperature gradient set between the magnetic insulator and metallic electrodes induces the spin current flowing through the system. The generated spin current of magnonic (electric) type is converted to electric (magnonic) spin current by means of quantum dot. Expanding spin and heat currents flowing through the system, up to linear order, we introduce basic spin thermoelectric coefficients including spin conductance, spin Seebeck and spin Peltier coefficients and heat conductance. We analyse the spin thermoelectric properties of the system in two cases: in the large ondot Coulomb repulsion limit and when these interactions are finite.

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Quantum dot as spin current generator and energy harvester

Cited by 13 publications

References 79 publications

Fundamental aspects of steady-state conversion of heat to work at the nanoscale

Fundamental aspects of steady-state conversion of heat to work at the nanoscale

Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

Spin-thermoelectric effects in a quantum dot hybrid system with magnetic insulator

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