Thermodynamics of a Phase-Driven Proximity Josephson Junction

Vischi, Francesco; Carrega, Matteo; Braggio, Alessandro; Virtanen, Pauli; Giazotto, Francesco

doi:10.3390/e21101005

Cited by 8 publications

(20 citation statements)

References 123 publications

(215 reference statements)

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“…This makes spin flipper doped Josephson junction loop much more versatile as regards possible applications. As a quantum heat engine, the proposed device is much more efficient than previously proposed Josephson quantum heat engines [25,26]. Further, when operating as a quantum refrigerator, COP of the proposed device is higher than that seen in Refs.…”

Section: Experimental Realization and Conclusionmentioning

confidence: 71%

“…Josephson-Stirling cycle [25,26] represented in Fig. 2, involves two isothermal and two isophasic processes.…”

Section: Josephson-stirling Cyclementioning

confidence: 99%

“…Further, when operating as a quantum refrigerator, COP of the proposed device is higher than that seen in Refs. [25,26]. In Table I state is also possible, thus in presence of spin-flip scatter-ing (p = 0) Eqs.…”

Section: Experimental Realization and Conclusionmentioning

confidence: 99%

“…Josephson Stirling engines aren't the only game in town, diffusive SNS junctions have been shown to operate as a Josephson-Otto or as Josephson-Stirling engines in Ref. 26.…”

Section: Introductionmentioning

confidence: 99%

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Josephson quantum spin thermodynamics

Pal,

Benjamin

2021

Preprint

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A 1D Josephson junction loop, doped with a spin-flipper and attached to two thermal reservoirs is shown to operate as a heat engine, or a refrigerator, or a Joule pump or even as a cold pump. When operating as a quantum heat engine, the efficiency of this device exceeds that of some recent Josephson heat engine proposals. Further, as a quantum refrigerator, the coefficient of performance of this device is much higher than previously proposed Josephson junction based refrigerators. In addition, this device can be tuned from engine mode to refrigerator mode or to any other mode, i.e., Joule pump or cold pump by either tuning the temperature of reservoirs, or via the flux enclosed in the Josephson junction loop. This makes the proposed device much more versatile towards possible applications.

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Section: Experimental Realization and Conclusionmentioning

confidence: 71%

“…Josephson-Stirling cycle [25,26] represented in Fig. 2, involves two isothermal and two isophasic processes.…”

Section: Josephson-stirling Cyclementioning

confidence: 99%

Section: Experimental Realization and Conclusionmentioning

confidence: 99%

“…Josephson Stirling engines aren't the only game in town, diffusive SNS junctions have been shown to operate as a Josephson-Otto or as Josephson-Stirling engines in Ref. 26.…”

Section: Introductionmentioning

confidence: 99%

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Josephson quantum spin thermodynamics

Pal,

Benjamin

2021

Preprint

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“…Furthermore, it has been shown (employing Hill thermodynamics) that topological phases exhibit unexpected universalities in their thermodynamic signatures [55,56]. Motivated by this and by advances in the understanding of the thermodynamics of non-topological superconductors [57][58][59][60][61][62][63][64][65][66][67][68][69], we have recently applied these thermodynamic concepts to topological Josephson junctions to propose a topological Josephson heat engine [70]. In the same spirit, we discuss another way of utilizing coherent thermodynamics to demonstrate the peculiar nature of topological Josephson junctions: We show that measurements of the phasedependent heat capacity can provide distinct signatures originating from the topological ABS and thus repre-sent an alternative property which can be investigated in topological Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics in topological Josephson junctions

Scharf,

Braggio,

Strambini

et al. 2021

Preprint

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We study the thermodynamic properties of topological Josephson junctions using a quantum spin Hall (QSH) insulator-based junction as an example. In particular, we propose that phase-dependent measurements of the heat capacity offer an alternative to Josephson-current measurements to demonstrate key topological features. Even in an equilibrium situation, where the fermion parity is not conserved, the heat capacity exhibits a pronounced double peak in its phase dependence as a signature of the protected zero-energy crossing in the Andreev spectrum. This double-peak feature is robust against changes of the tunneling barrier and thus allows one to distinguish between topological and trivial junctions. At short time scales fermion parity is conserved and the heat capacity is 4π-periodic in the superconducting phase difference. We propose a dispersive setup coupling the Josephson junction to a tank LC circuit to measure the heat capacity of the QSH-based Josephson junction sufficiently fast to detect the 4π-periodicity. Although explicitly calculated for a short QSH-based Josephson junction, our results are also applicable to long as well as nanowire-based topological Josephson junctions.

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Topological Josephson heat engine

et al. 2020

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Topological superconductors represent a fruitful playing ground for fundamental research as well as for potential applications in fault-tolerant quantum computing. Especially Josephson junctions based on topological superconductors remain intensely studied, both theoretically and experimentally. The characteristic property of these junctions is their 4π-periodic ground-state fermion parity in the superconducting phase difference. Using such topological Josephson junctions, we introduce the concept of a topological Josephson heat engine. We discuss how this engine can be implemented as a Josephson–Stirling cycle in topological superconductors, thereby illustrating the potential of the intriguing and fruitful marriage between topology and coherent thermodynamics. It is shown that the Josephson–Stirling cycle constitutes a highly versatile thermodynamic machine with different modes of operation controlled by the cycle temperatures. Finally, the thermodynamic cycle reflects the hallmark 4π-periodicity of topological Josephson junctions and could therefore be envisioned as a complementary approach to test topological superconductivity.

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Thermodynamics of a Phase-Driven Proximity Josephson Junction

Cited by 8 publications

References 123 publications

Josephson quantum spin thermodynamics

Josephson quantum spin thermodynamics

Thermodynamics in topological Josephson junctions

Topological Josephson heat engine

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