All-thermal transistor based on stochastic switching

Sánchez, Rafael; Thierschmann, Holger; Molenkamp, Laurens W.

doi:10.1103/physrevb.95.241401

Cited by 49 publications

(47 citation statements)

References 34 publications

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“…This can be achieved either by operating at low tempreature, kT E C  (i.e. eliminating one of the states), or by acting on the energy-resolved tunneling rates (eliminating one of the transitions) [82]. Time-resolved measurement of fluctuations in the former configuration have been recently reported in single-electron transistors [86].…”

Section: Energy Filtering: a Thermal Transistormentioning

confidence: 99%

“…Its level can be chosen to inject electrons only either at U G0 D or U G1 D , thus providing a configuration with either 0 G1 G = , or with 0 G0 G = , respectively. They would work as thermal transistors around different triple points in the stability diagram [82].…”

Section: Quantum Dot Arrays For Energy Filteringmentioning

confidence: 99%

“…We extend the investigation of such thermal gating to the gating of thermally-induced heat currents. A first step was done in [82] where the gate dot acts as a switch. As we show here, exploiting the energy dependence of tunneling effects in the conductor dot, the same device becomes a versatile thermal device.…”

Section: Introductionmentioning

confidence: 99%

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Single-electron thermal devices coupled to a mesoscopic gate

2017

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The cooling effect in an InAs quantum dot subjected to THz irradiation and an external magnetic field X. AbstractWe theoretically investigate the propagation of heat currents in a three-terminal quantum dot engine. Electron-electron interactions introduce state-dependent processes which can be resolved by energydependent tunneling rates. We identify the relevant transitions which define the operation of the system as a thermal transistor or a thermal diode. In the former case, thermal-induced charge fluctuations in the gate dot modify the thermal currents in the conductor with suppressed heat injection, resulting in huge amplification factors and the possible gating with arbitrarily low energy cost. In the latter case, enhanced correlations of the state-selective tunneling transitions redistribute heat flows giving high rectification coefficients and the unexpected cooling of one conductor terminal by heating the other one. We propose quantum dot arrays as a possible way to achieve the extreme tunneling asymmetries required for the different operations.

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Section: Energy Filtering: a Thermal Transistormentioning

confidence: 99%

Section: Quantum Dot Arrays For Energy Filteringmentioning

confidence: 99%

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Single-electron thermal devices coupled to a mesoscopic gate

2017

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“…In addition to the above, theoretical studies have predicted a wide range of novel thermoelectric effects in CCQD systems [10][11][12][13]. The mechanisms behind these effects rely on the presence of a strong Coulomb interaction between electrons in the otherwise decoupled QDs (see Fig.…”

Section: Introductionmentioning

confidence: 98%

“…While the operation principles of the above-mentioned effects are governed by incoherent electron tunneling (sequential tunneling) processes between the leads and the QDs [8][9][10][11][12][13], the importance of coherent higher-order tunneling (cotunneling) processes for nonlinear heat transport remains largely unexplored. Furthermore, when operated under strong nonequilibrium conditions in which linear-response theory breaks down, a theoretical treatment taking into account the * nicwall@nanotech.dtu.dk † kkaa@nanotech.dtu.dk full nonlinear properties is needed [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectrics in Coulomb-coupled quantum dots: Cotunneling and energy-dependent lead couplings

2017

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We study thermoelectric effects in Coulomb-coupled quantum-dot (CCQD) systems beyond lowest-order tunneling processes and the often applied wide-band approximation. To this end, we present a master-equation (ME) approach based on a perturbative T -matrix calculation of the charge and heat tunneling rates and transport currents. Applying the method to transport through a noninteracting single-level QD, we demonstrate excellent agreement with the Landauer-Büttiker theory when higher-order (cotunneling) processes are included in the ME. Next, we study the effect of cotunneling and energy-dependent lead couplings on the heat currents in a system of two CCQDs. We find that cotunneling processes (i) can dominate the off-resonant heat currents at low temperature and bias compared to the interdot interaction, and (ii) give rise to a pronounced reduction of the cooling power achievable with the recently demonstrated Maxwell's demon cooling mechanism. Furthermore, we demonstrate that the cooling power can be boosted significantly by carefully engineering the energy dependence of the lead couplings to filter out undesired transport processes. Our findings emphasize the importance of higher-order cotunneling processes as well as engineered energy-dependent lead couplings in the optimization of the thermoelectric performance of CCQD systems.

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Transport Out of Locally Broken Detailed Balance

Sánchez

2018

Springer Proceedings in Mathematics &Amp; Statistics

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Electrons move along potential or thermal gradients. In the presence of a global gradient, applied e.g. to the two terminals of a conductor, this induces electric charge and heat currents. They can also flow between two equilibrated terminals (at the same voltage and temperature) if detailed balance is broken in some part of the system. A minimal model involving two metallic islands in series is introduced whose internal potential and temperatures can be externally modulated. The conditions for a finite electric flow are discussed.

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All-thermal transistor based on stochastic switching

Cited by 49 publications

References 34 publications

Single-electron thermal devices coupled to a mesoscopic gate

Single-electron thermal devices coupled to a mesoscopic gate

Thermoelectrics in Coulomb-coupled quantum dots: Cotunneling and energy-dependent lead couplings

Transport Out of Locally Broken Detailed Balance

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