Tunable charge and spin Seebeck effects in magnetic molecular junctions

Cornaglia, P. S.; Usaj, Gonzalo; Balseiro, C. A.

doi:10.1103/physrevb.86.041107

Cited by 25 publications

(26 citation statements)

References 27 publications

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“…The similar conclusions have been confirmed in double quantum dot molecular junction [18,19]. Since the thermoelectric effect in molecular junction can reveal transport mechanisms through the molecular junction [20] and the experiments have demonstrated the capability of measuring the Seebeck coefficient in atomic and molecular junctions [21,Resonance Tunnelling 22], the thermoelectric effect of the single molecule devices attracts much interest [5,17,[23][24][25][26][27].…”

Section: Introductionsupporting

confidence: 51%

Enhancement of Thermoelectric Effects in a Single Molecular Magnet due to Resonance Tunnelling

Wang¹

2014

AJMP

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Thermoelectric properties of the single molecular magnet coupled to two metal electrodes are investigated theoretically. For the infinite Coulomb interaction the singly-occupied states determine the effective transport channels. At the low temperature the thermopower and the figure of merit present the large values near bonding state level, and for the given temperature the thermopower and the figure of merit are significantly enhanced with coupling intensity decreasing. When Coulomb interaction is finite, the spectra of thermoelectric quantities split into two sets. The peaks of the thermopower and figure of merit corresponding to doubly-occupied transport channels are much larger than unity for the small coupling intensity. These results are useful for understanding and designing highly efficient thermoelectric devices based on molecular magnet.

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Section: Introductionsupporting

confidence: 51%

Enhancement of Thermoelectric Effects in a Single Molecular Magnet due to Resonance Tunnelling

Wang¹

2014

AJMP

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“…An accurate description of the spectral and transport properties in the most challenging (nonperturbative) regime of intermediate temperatures and bias voltages T, φ T K has however not been feasible until recently. While the electronic transport has been studied extensively, the thermoelectric transport theory mostly focused on the linear response regime 13,25,[71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] . The nonlinear regime has been addressed mainly in the weak coupling limit 32,78,[90][91][92][93][94][95][96][97] , a systematic analysis including renormalization effects 66,67,98,99 beyond the perturbative regime is still missing.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

et al. 2016

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We study nonequilibrium thermoelectric transport properties of a correlated impurity connected to two leads for temperatures below the Kondo scale. At finite bias, for which a current flows across the leads, we investigate the differential response of the current to a temperature gradient. In particular, we compare the influence of a bias voltage and of a finite temperature on this thermoelectric response. This is of interest from a fundamental point of view to better understand the two different decoherence mechanisms produced by a bias voltage and by temperature. Our results show that in this respect the thermoelectric response behaves differently from the electric conductance. In particular, while the latter displays a similar qualitative behavior as a function of voltage and temperature, both in theoretical and experimental investigations, qualitative differences occur in the case of the thermoelectric response. In order to understand this effect, we analyze the different contributions in connection to the behavior of the impurity spectral function versus temperature. Especially in the regime of strong interactions and large enough bias voltages we obtain a simple picture based on the asymmetric suppression or enhancement of the split Kondo peaks as a function of the temperature gradient. Besides the academic interest, these studies could additionally provide valuable information to assess the applicability of quantum dot devices as responsive nanoscale temperature sensors.

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“…However, usually the anisotropy D ∼ µeV is much smaller than other energy scales (∼meV) of interest. Thus, the effect of magnetic anisotropy will be insignificant except in the extremely low temperature regime, where the Kondo effect may play a role 32,[37][38][39][40][41][42][43][44][45] and is beyond the scope of the present work. For large spin cases without anisotropy, they share quantitatively the same behaviors as the spin-half case that we will discuss in detail in the following.…”

Section: Resultsmentioning

confidence: 98%

Nanoscale Spin Seebeck Rectifier: Controlling Thermal Spin Transport across Insulating Magnetic Junctions with Localized Spin

2014

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The spin Seebeck effect is studied across a charge insulating magnetic junction, in which thermal-spin conjugate transport is assisted by the exchange interactions between the localized spin in the center and electrons in metallic leads. We show that, in contrast with bulk spin Seebeck effect, the figure of merit of such nanoscale thermal-spin conversion can be infinite, leading to the ideal Carnot efficiency in the linear response regime. We also find that in the nonlinear spin Seebeck transport regime, the device possesses the asymmetric and negative differential spin Seebeck effects. In the last, the situations with leaking electron tunneling are also discussed. This nanoscale thermal spin rectifier, by tuning the junction parameters, can act as a spin Seebeck diode, spin Seebeck transistor and spin Seebeck switch, which could have substantial implications for flexible thermal and information control in molecular spin caloritronics.

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Tunable charge and spin Seebeck effects in magnetic molecular junctions

Cited by 25 publications

References 27 publications

Enhancement of Thermoelectric Effects in a Single Molecular Magnet due to Resonance Tunnelling

Enhancement of Thermoelectric Effects in a Single Molecular Magnet due to Resonance Tunnelling

Thermoelectric response of a correlated impurity in the nonequilibrium Kondo regime

Nanoscale Spin Seebeck Rectifier: Controlling Thermal Spin Transport across Insulating Magnetic Junctions with Localized Spin

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