Cooling electrons from 1 to 0.4 K with V-based nanorefrigerators

Quaranta, Orlando; Spathis, Panayotis; Beltram, Fabio; Giazotto, F.

doi:10.1063/1.3544058

Cited by 39 publications

(34 citation statements)

References 15 publications

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“…The relative temperature drop is expected to increase when the base temperature is lowered, which we verify here experimentally down to 80 mK. This feature makes the CBR suited for temperatures below 100 mK, and could be used in cascade coolers as the last * anna.feshchenko@aalto.fi stage, for example, in combination with a superconducting refrigerator [22]. Here we want to emphasize the most important feature of the CBR.…”

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confidence: 85%

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Experimental realization of a Coulomb blockade refrigerator

2014

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We present an experimental realization of a Coulomb blockade refrigerator (CBR) based on a single-electron transistor (SET). In the present structure, the SET island is interrupted by a superconducting inclusion to permit charge transport while preventing heat flow. At certain values of the bias and gate voltages, the current through the SET cools one of the junctions. The measurements follow the theoretical model down to ∼80 mK, which was the base temperature of the current measurements. The observed cooling increases rapidly with decreasing temperature, in agreement with the theory, reaching about a 15 mK drop at the base temperature. The CBR appears as a promising electronic cooler at temperatures well below 100 mK.

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confidence: 85%

“…To realize the CBR, we make use of several different types of high-quality Al junctions, all contacting Cu, compatible with cofabrication of other metallic structures [15,16,22].…”

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confidence: 99%

Experimental realization of a Coulomb blockade refrigerator

2014

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“…The adjustable (by gate voltage) gap makes the presented cooler attractive for very low temperature operation and possibly as a low-temperature stage in a cascade cooler in combination with a fixed-gap superconducting refrigerator [18]. …”

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confidence: 99%

Refrigerator based on the Coulomb barrier for single-electron tunneling

2014

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“…In this work, we demonstrate that the tunnel current in a novel heavy-fermion/ insulator/superconductor (HIS) junction is likely to be significantly higher than that of a conventional NIS junction due to existence of the resonant density of states, leading to enhanced cooling performance of electron-tunneling refrigerators. This enhanced tunneling is analogous to that in an superconductor-insulator-superconductor (SIS) junction, which has been demonstrated to enhance electron cooling at temperatures around 1 K. 11 In an SIS junction, the two superconductors both have peaks in the density of states at the band edge, and when these align, it results in enhanced cooling.…”

Section: Introductionmentioning

confidence: 99%

Millikelvin cooling by heavy-fermion-based tunnel junctions

Prest

Min

Whall

2015

Journal of Applied Physics

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This paper addresses a high-performance electron-tunneling cooler based on a novel heavy-fermion/insulator/superconductor junction for millikelvin cooling applications. We show that the cooling performance of an electronic tunneling refrigerator could be significantly improved using a heavy-fermion metal to replace the normal metal in a conventional normal metal/insulator/superconductor junction. The calculation, based on typical parameters, indicates that, for a bath temperature of 300 mK, the minimum cooling temperature of an electron tunneling refrigerator is reduced from around 170 mK to below 50 mK if a heavy-fermion metal is employed in place of the normal metal. The improved cooling is attributed to an enhancement in electron tunneling due to the existence of a resonant density of states at the Fermi level.

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Cooling electrons from 1 to 0.4 K with V-based nanorefrigerators

Cited by 39 publications

References 15 publications

Experimental realization of a Coulomb blockade refrigerator

Experimental realization of a Coulomb blockade refrigerator

Refrigerator based on the Coulomb barrier for single-electron tunneling

Millikelvin cooling by heavy-fermion-based tunnel junctions

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