Single-Quantum-Dot Heat Valve

Dutta, Bivas; Majidi, Danial; Talarico, N. W.; Gullo, Nicola; Courtois, Hervé; Winkelmann, Clemens

doi:10.1103/physrevlett.125.237701

Cited by 39 publications

(27 citation statements)

References 47 publications

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“…This is changed by the introduction of a QD to the system. The QD drastically decreases the conductance and suppresses electronic heat transfer away from the charge degeneracy points [40,41], while the phononic contribution is expected to remain unaffected by the QD [7,39]. Because the heating power in our symmetric bottom-heater architecture only depends on the magnitude of dV H rather than the heater location or nanowire configuration, T is found to coincide for all tested QD and heater combinations.…”

Section: Quantum Dot Thermoelectricsmentioning

confidence: 87%

“…The transition from a barrier-free nanowire to a QD configuration is expected to drastically affect heat flow through the nanowire as a result of the suppressed electronic heat flow contribution [39,41]. We use thermocurrent measurements on QDs situated on different sides of the nanowire to probe the local temperature on the either side of the barriers.…”

Section: Discussionmentioning

confidence: 99%

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Characterization of electrostatically defined bottom-heated InAs nanowire quantum dot systems

2021

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Conversion of temperature gradients to charge currents in quantum dot systems enables probing various concepts from highly efficient energy harvesting and fundamental thermodynamics to spectroscopic possibilities complementary to conventional bias device characterization. In this work, we present a proof-of-concept study of a device architecture where bottom-gates are capacitively coupled to an InAs nanowire and double function as local joule heaters. The device design combines the ability to heat locally at different locations on the device with the electrostatic definition of various quantum dot and barrier configurations. We demonstrate the versatility of this combined gating- and heating approach by studying, as a function of the heater location and bias, the Seebeck effect across the barrier-free nanowire, fit thermocurrents through quantum dots for thermometry and detect the phonon energy using a serial double quantum dot. The results indicate symmetric heating effects when the device is heated with different gates and we present detection schemes for the electronic and phononic heat transfer contribution across the nanowire. Based on this proof-of-principle work, we propose a variety of future experiments.

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Section: Quantum Dot Thermoelectricsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Characterization of electrostatically defined bottom-heated InAs nanowire quantum dot systems

2021

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“…where t α represents the coupling energy between the electrons in the contacts and the dot and is independent of momentum k and spin σ . In numerous quantum dot spin valve structures, the spin direction of the magnetic leads are non-collinear [71][72][73]. If the polarization basis of the contact α with respect to the dot is tilted by angles (θ α , φ α ) (where θ α is the tilt with respect to the z-axis and φ α being the angle made with the azimuthal plane), then Eq.…”

Section: A Hamiltonian Of the Setupmentioning

confidence: 99%

Steady-State Tunable Entanglement Thermal Machine Using Quantum Dots

Das¹,

Khan²,

Mishra³

et al. 2021

Preprint

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We present a solid state thermal machine based on quantum dots to generate steady-state entanglement between distant spins. Unlike previous approaches our system is controlled by experimentally feasible steady state currents manipulated by dc voltages. By analyzing the Liouvillian eigenspectrum as a function of the control parameters, we show that our device operates over a large voltage region. As an extension, the proposed device also works as an entanglement thermal machine under a temperature gradient that can even give rise to entanglement at zero voltage bias. Finally, we highlight a post-selection scheme based on currently feasible non-demolition measurement techniques that can generate perfect Bell-pairs from the steady state output of our thermal machine.

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“…Although the field of thermotronics is still in its infancy, several basic components have already been proposed and realized such as thermal transistors [14,15], thermal memories [16][17][18], thermal heat valves [19,20], and thermal switches [21]. When combined, these elements may pave the way for logic circuits that process a thermal input signal and return an output signal in terms of a heat current [22].…”

Section: Introductionmentioning

confidence: 99%

Heat transport in a two-level system driven by a time-dependent temperature

2021

Self Cite

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The field of thermotronics aims to develop thermal circuits that operate with temperature biases and heat currents just as how electronic circuits are based on voltages and electric currents. Here, we investigate a thermal half-wave rectifier based on a quantum two-level system (a qubit) that is driven by a periodically modulated temperature difference across it. To this end we present a nonequilibrium Green's function technique, which we extend to the time domain to account for the time-dependent temperature in one of two thermal reservoirs connected to the qubit. We find that the qubit acts a thermal diode in parallel with a thermal capacitor, whose capacitance is controlled by the coupling to the reservoirs. These findings are important for the efforts to design nonlinear thermal components such as heat rectifiers and multipliers that operate with more than one diode.

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Single-Quantum-Dot Heat Valve

Cited by 39 publications

References 47 publications

Characterization of electrostatically defined bottom-heated InAs nanowire quantum dot systems

Characterization of electrostatically defined bottom-heated InAs nanowire quantum dot systems

Steady-State Tunable Entanglement Thermal Machine Using Quantum Dots

Heat transport in a two-level system driven by a time-dependent temperature

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