Influence of interference effects on thermoelectric properties of double quantum dots

Wierzbicki, M.; Świrkowicz, R.

doi:10.1103/physrevb.84.075410

Cited by 86 publications

(78 citation statements)

References 65 publications

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“…Related findings were presented in Ref. 12, where the thermoelectric properties of double quantum dots with couplings ranging from serial to parallel configurations were investigated, assuming equal energies of the two dots.…”

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confidence: 68%

Increasing thermoelectric performance using coherent transport

et al. 2011

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We show that coherent electron transport through zero-dimensional systems can be used to tailor the shape of the system's transmission function. This quantum-engineering approach can be used to enhance the performance of quantum dots or molecules in thermal-to-electric power conversion. Specifically, we show that electron interference in a two-level system can substantially improve the maximum thermoelectric power and the efficiency at maximum power by suppressing parasitic charge flow near the Fermi energy, and by reducing electronic heat conduction. We discuss possible realizations of this approach in molecular junctions or quantum dots.

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confidence: 68%

Increasing thermoelectric performance using coherent transport

et al. 2011

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“…confined dimensions 12,13 such as nano-wires, [14][15][16] quasi-1D systems, [17][18][19] and effective 0-D systems such as quantum dots, [20][21][22] , single molecule [23][24][25] and single atom 26 systems; under conditions of quantum criticality; [27][28][29][30][31] in superconductors; 16,[32][33][34][35][36][37][38] in superlattices and granular metals; [39][40][41][42][43] and in the presence of disorder.…”

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confidence: 99%

On the Lorenz number of multiband materials

2017

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There are many exotic scenarios where the Lorenz number of the Wiedemann-Franz law is known to deviate from expected values. However, in conventional semiconductor systems, it is assumed to vary between the values of ∼1.49 × 10 −8 W Ω K −2 for non-degenerate semiconductors and ∼2.45 × 10 −8 W Ω K −2 for degenerate semiconductors or metals. Knowledge of the Lorenz number is important in many situations, such as in the design of thermoelectric materials and in the experimental determination of the lattice thermal conductivity. Here we show that, even in the simple case of two and three band semiconductors, it is possible to obtain substantial deviations of a factor of two (or in the case of a bipolar system with a Fermi level near the midgap, even orders of magnitude) from expectation. In addition to identifying the sources of deviation in unipolar and bipolar two-band systems, a number of analytical expressions useful for quantifying the size of the effect are derived. As representative case-studies, a three-band model of the materials of lead telluride (PbTe) and tin sellenide (SnSe), which are important thermoelectric materials, is also developed and the size of possible Lorenz number variations in these materials explored. Thus, the consequence of multi-band effects on the Lorenz number of real systems is demonstrated.

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“…Theoretical studies of double quantum dots have been started very early with the main interests being focused on the Coulomb blockade effect [21][22][23][24][25][26], shot noise, tunnel magnetoresistance [27,28], etc. Later on, similar systems consisting of a single or double quantum dot have been extensively studied with the aim to find configurations with enhanced Seebeck coefficient S c or thermoelectric figure of merit Z c T [13,[29][30][31][32][33][34] or their spin counterparts i.e. spin Seebeck coefficient S s and spin thermoelectric figure of merit Z s T [12,13,29,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49].…”

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confidence: 99%

Quantum dot as spin current generator and energy harvester

Szukiewicz

Wysokiński

2015

Eur. Phys. J. B

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Abstract. The thermoelectric transport in the device composed of a central nanoscopic system in contact with two electrodes and subject to the external magnetic field of Zeeman type has been studied. The device can support pure spin current in the electrodes and may serve as a source of the temperature induced spin currents with possible applications in spintronics. The system may also be used as an energy harvester. We calculate its thermodynamic efficiency η and the power output P . The maximal efficiency of the device reaches the Carnot value when the device works reversibly but with the vanishing power. The interactions between carriers diminish the maximal efficiency of the device, which under the constant load drops well below the Carnot limit but may exceed the Curzon-Ahlborn limit. While the effect of intradot Coulomb repulsion on η depends on the parameters, the interdot/interlevel interaction strongly diminishes the device efficiency.

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Influence of interference effects on thermoelectric properties of double quantum dots

Cited by 86 publications

References 65 publications

Increasing thermoelectric performance using coherent transport

Increasing thermoelectric performance using coherent transport

On the Lorenz number of multiband materials

Quantum dot as spin current generator and energy harvester

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