Optimized Peltier cooling via an array of quantum dots with stair-like ground-state energy configuration

Singha, Aniket

doi:10.1016/j.physleta.2018.07.017

Cited by 12 publications

(5 citation statements)

References 43 publications

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“…This can be explained by the fact that an increase in the bias voltage causes a higher power dissipation per unit electron flow (qV ) or per unit heat packet (U m ) absorption from G, which results in a decrease in COP . It should be noted that an equivalent trend of increase in refrigeration power and decrease in overall COP with increase in bias voltage can also be noted for lower dimensional and bulk Peltier refrigerators [20,22].…”

Section: Resultsmentioning

confidence: 87%

Realistic non-local refrigeration engine based on Coulomb coupled systems

Barman,

Halder,

Varshney

et al. 2020

Preprint

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Employing Coulomb-coupled systems, we demonstrate a cryogenic non-local refrigeration engine, that circumvents the need for a change in the energy resolved system-to-reservoir coupling, demanded by the recently proposed non-local refrigerators [1][2][3][4][5]. We demonstrate that an intentionally introduced energy difference between the ground states of adjacent tunnel coupled quantum dots, associated with Coulomb coupling, is sufficient to extract heat from a remote target reservoir. Investigating the performance and operating regime using quantum-master-equation (QME) approach, we point out to some crucial aspects of the proposed refrigeration engine. In particular, we demonstrate that the maximum cooling power for the proposed set-up is limited to about 70% of the optimal design. Proceeding further, we point out that to achieve a target reservoir temperature, lower compared to the average temperature of the current path, the applied voltage must be greater than a given threshold voltage VT H , that increases with decrease in the target reservoir temperature. In addition, we demonstrate that the maximum cooling power, as well as the coefficient of performance deteriorates as one approaches a lower target reservoir temperature. The novelty of the proposed refrigeration engine is the integration of fabrication simplicity along with descent cooling power. The idea proposed in this paper may pave the way towards the realization of efficient non-local cryogenic refrigeration systems.

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Section: Resultsmentioning

confidence: 87%

Realistic non-local refrigeration engine based on Coulomb coupled systems

Barman,

Halder,

Varshney

et al. 2020

Preprint

Self Cite

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“…Device engineering with the ambition to couple system thermal parameters with electrically measurable quantities has been extremely challenging in nano-scale regime. In the recent era of nano-scale engineering, thermal manipulation of electron flow has manifested itself in the proposals of thermoelectric engines , refrigerators [27][28][29][30][31][32][33][34][35][36][37], rectifiers [38][39][40][41][42][43] and transistors [44][45][46][47][48][49][50][51]. In addition, the possibility of non-local thermal control of electrical parameters has been also been proposed and demonstrated experimentally [52][53][54][55][56][57][58][59][60][61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

Non-local triple quantum dot thermometer based on Coulomb-coupled systems

Singha¹

2021

Preprint

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Recent proposals towards non-local thermoelectric voltage-based thermometry, in the conventional dual quantum dot set-up, demand an asymmetric step-like system-to-reservoir coupling around the ground states for optimal operation (Physica E, 114, 113635, 2019). In addition to such demand for unrealistic coupling, the sensitivity in such a strategy also depends on the average measurement terminal temperature, which may result in erroneous temperature assessment. In this paper, I propose non-local current based thermometry in the dual dot set-up as a practical alternative and demonstrate that in the regime of high bias, the sensitivity remains robust against fluctuations of the measurement terminal temperature. Proceeding further, I propose a non-local triple quantum dot thermometer, that provides an enhanced sensitivity while bypassing the demand for unrealistic step-like system-to-reservoir coupling and being robust against fabrication induced variability in Coulomb coupling. In addition, I show that the heat extracted from (to) the target reservoir, in the triple dot design, can also be suppressed drastically by appropriate fabrication strategy, to prevent thermometry induced drift in reservoir temperature. The proposed triple dot setup thus offers a multitude of benefits and could potentially pave the path towards the practical realization and deployment of high-performance non-local "sub-Kelvin range" thermometers.

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“…Engineering devices to couple heat with electrically measurable quantities has been extremely difficult in the domain of solid-state nano-technology. In the aspect of thermally controlled electrical transport in nano-scale systems; thermoelectric engines , refrigerators [27][28][29][30][31][32][33][34][35][36][37][38], rectifiers [39][40][41][42][43][44] and transistors [45][46][47][48][49][50][51][52] have been proposed in the last decade. Recently, the provision towards non-local thermal control of electrical transport, where electrical variables between two terminals are manipulated via thermal action at a remote third terminal, has been proposed and realized experimentally [53][54][55][56][57][58][59][60][61][62][63][64][65].…”

Section: Introductionmentioning

confidence: 99%

A non-local cryogenic thermometer based on Coulomb-coupled systems

Banerjee,

Singha

2020

Preprint

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We propose a realistic design for Coulomb-coupled system based non-local cryogenic electrical thermometer. The operation of the proposed thermometer relies on electrostatic interaction between Coulomb coupled quantum dots, resulting in a overall change in conductance due to change in the remote reservoir temperature. The performance and regime of operation of the proposed thermometer is then theoretically investigated using density matrix formulation and compared with another recently proposed Coulomb coupled system based thermometer. It is demonstrated that the proposed design ensures a superior temperature sensitivity and robustness compared to the other design proposed in literature (Physica E, 114, 113635, 2019). At the end we investigate the regime of optimal operation and comment on the ground state configuration for optimal operation of the proposed thermometer. The design proposed in this paper can be employed to construct highly efficient non-local cryogenic thermometers.

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Optimized Peltier cooling via an array of quantum dots with stair-like ground-state energy configuration

Cited by 12 publications

References 43 publications

Realistic non-local refrigeration engine based on Coulomb coupled systems

Realistic non-local refrigeration engine based on Coulomb coupled systems

Non-local triple quantum dot thermometer based on Coulomb-coupled systems

A non-local cryogenic thermometer based on Coulomb-coupled systems

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