2008
DOI: 10.1103/physrevb.77.104517
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Influence of photon-assisted tunneling on heat flow in a normal metal–superconductor tunnel junction

Abstract: We have investigated theoretically the influence of an ac drive on heat transport in a hybrid normal metalsuperconductor tunnel junction in the photon-assisted tunneling regime. We find that the useful heat flux out from the normal metal is always reduced as compared to its magnitude under the static and quasistatic drive conditions. Our results are useful to predict the operative conditions of ac-driven superconducting electron refrigerators.

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Cited by 8 publications
(9 citation statements)
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“…Singleelectron Coulomb blockade opens, however, a way to manipulate heat flow on the level of individual electrons [11] and to synchronize the refrigerator operation to an external frequency of the ac drive, as was predicted in [12]. Although the ac operation may not produce more efficient refrigeration than the devices with a constant bias [12,13], the former one has some benefits, the main one being that no constant chemical potential difference is needed between the leads. It can be run nongalvanically by applying an alternating voltage at the gate.…”
mentioning
confidence: 99%
“…Singleelectron Coulomb blockade opens, however, a way to manipulate heat flow on the level of individual electrons [11] and to synchronize the refrigerator operation to an external frequency of the ac drive, as was predicted in [12]. Although the ac operation may not produce more efficient refrigeration than the devices with a constant bias [12,13], the former one has some benefits, the main one being that no constant chemical potential difference is needed between the leads. It can be run nongalvanically by applying an alternating voltage at the gate.…”
mentioning
confidence: 99%
“…In our calculation we set a standard drive frequency of ν = 1 GHz. Such a frequency allows us to safely neglect the heating due to the photon-assisted tunneling induced by the drive, as this usually becomes relevant above frequencies of the order of 10 GHz 41 . The SQUID fabrication parameters can be tailored so that V stat is close to the matching peak at (∆ 2 − ∆ 1 )/e thereby maximizing the cooling power [see Fig.…”
Section: Squid Dynamicsmentioning
confidence: 99%
“…Previously, a similar approach has been used in Ref. 30 for studying time-dependent heat transport in NIS junctions, and it has been extensively applied for examining the charge transport (see e.g. Refs.…”
Section: Introductionmentioning
confidence: 99%