Enhanced thermopower under a time-dependent gate voltage

Crépieux, Adeline; Šimkovic, Fedor; Cambon, Benjamin; Michelini, Fabienne

doi:10.1103/physrevb.83.153417

Cited by 58 publications

(45 citation statements)

References 32 publications

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“…Here, the nanoscale system itself provides the strong energy dependence required for thermoelectric effects, both through strong size-quantization and Coulomb interaction. Models of this kind are relevant in many thermoelectric studies [38,[42][43][44][45] and the duality applies to their description, even when the energy-independent coupling is strong and the temperature is low [29], cf. [36,37].…”

Section: Overview Of Main Ideas and Resultsmentioning

confidence: 99%

Thermoelectrics of Interacting Nanosystems—Exploiting Superselection Instead of Time-Reversal Symmetry

Schulenborg

Marco

Vanherck

et al. 2017

Entropy

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Thermoelectric transport is traditionally analyzed using relations imposed by time-reversal symmetry, ranging from Onsager's results to fluctuation relations in counting statistics. In this paper, we show that a recently discovered duality relation for fermionic systems-deriving from the fundamental fermion-parity superselection principle of quantum many-particle systems-provides new insights into thermoelectric transport. Using a master equation, we analyze the stationary charge and heat currents through a weakly coupled, but strongly interacting single-level quantum dot subject to electrical and thermal bias. In linear transport, the fermion-parity duality shows that features of thermoelectric response coefficients are actually dominated by the average and fluctuations of the charge in a dual quantum dot system, governed by attractive instead of repulsive electron-electron interaction. In the nonlinear regime, the duality furthermore relates most transport coefficients to much better understood equilibrium quantities. Finally, we naturally identify the fermion-parity as the part of the Coulomb interaction relevant for both the linear and nonlinear Fourier heat. Altogether, our findings hence reveal that next to time-reversal, the duality imposes equally important symmetry restrictions on thermoelectric transport. As such, it is also expected to simplify computations and clarify the physical understanding for more complex systems than the simplest relevant interacting nanostructure model studied here.

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Section: Overview Of Main Ideas and Resultsmentioning

confidence: 99%

Thermoelectrics of Interacting Nanosystems—Exploiting Superselection Instead of Time-Reversal Symmetry

Schulenborg

Marco

Vanherck

et al. 2017

Entropy

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show abstract

“…For the time-dependent heat current due to electrons, the transient heat current has been investigated for a quantum dot under an upward pulse of gate voltage within the WBL where the enhanced thermal power was observed [31]. It is desirable to study the transient heat current when the external bias is switched on.…”

Section: Introductionmentioning

confidence: 99%

Investigation of transient heat current from first principles using complex absorbing potential

Zhang

Xing

et al. 2014

Phys. Rev. B

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We report on a first-principles investigation of transient heat current through molecular devices under steplike pulse of external and gate voltages. Using the nonequilibrium Green's function (NEGF) approach, an exact solution of transient heat current is obtained that goes beyond the wide-band limit. Combining with densityfunctional theory (DFT), we propose a time-dependent NEGF-DFT formalism to study the transient heat current under a steplike pulse for molecular devices from first principles. Anticipating the huge computational cost in the transient regime, we develop an algorithm to speed up the calculation using the complex absorbing potential (CAP). By adding the CAP to replace the Hamiltonian of leads, the effective self-energy of the Green's function becomes independent of energy, allowing analytic calculation of the triple integrations in the exact solution of transient heat current using the theorem of residue. With this linear scaling algorithm, the computational complexity is greatly reduced, and a first-principles calculation of transient heat current of molecular devices becomes possible. As an example, we apply our NEGF-DFT-CAP formalism for a molecular device, the Di-thiol benzene molecule connected by two semi-infinite aluminum leads, and we calculate the transient heat current under an upward gate voltage pulse. The enhancement of heat current is observed.

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“…In the case of P ac , since it is a second-order quantity, it has a contribution not only of the frozen solutions but also of the corrections ∆λ V,ω (t) and ∆B 2 V,ω (t). Explicit expressions of the Onsager coefficients L 21 and L 22 in terms of the frozen solutions and the corrections can be found in Appendix C, where we also show the validity of the Onsager reciprocal relation (30), and that the dissi-pative coefficient reads…”

Section: Transport Coefficientsmentioning

confidence: 58%

Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions

Ludovico

Capone

2018

Phys. Rev. B

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We study the relation between quantum pumping of charge and the work exchanged with the driving potentials in a strongly interacting ac-driven quantum dot. We work in the large-interaction limit and in the adiabatic pumping regime, and we develop a treatment that combines the timedependent slave-boson approximation with linear response in the rate of change of the ac-potentials. We find that the time evolution of the system can be described in terms of equilibrium solutions at every time. We analyze the effect of the electronic interactions on the performance of the dot when operating as a quantum motor.The main two effects of the interactions are a shift of the resonance and an enhancement of the efficiency with respect to a non-interacting dot. This is due to the appearance of additional acparameters accounting for the interactions that increase the pumping of particles while decreasing the conductance.

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Enhanced thermopower under a time-dependent gate voltage

Cited by 58 publications

References 32 publications

Thermoelectrics of Interacting Nanosystems—Exploiting Superselection Instead of Time-Reversal Symmetry

Thermoelectrics of Interacting Nanosystems—Exploiting Superselection Instead of Time-Reversal Symmetry

Investigation of transient heat current from first principles using complex absorbing potential

Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions

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