A1 Journal article (refereed)
Thermoelectric radiation detector based on a superconductor-ferromagnet junction : Calorimetric regime (2018)

Chakraborty, S., & Heikkilä, T. (2018). Thermoelectric radiation detector based on a superconductor-ferromagnet junction : Calorimetric regime. Journal of Applied Physics, 124(12), Article 123902. https://doi.org/10.1063/1.5037405

JYU authors or editors

Publication details

All authors or editors: Chakraborty, Subrata; Heikkilä, Tero

Journal or series: Journal of Applied Physics

ISSN: 0021-8979

eISSN: 1089-7550

Publication year: 2018

Volume: 124

Issue number: 12

Article number: 123902

Publisher: AIP Publishing LLC

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1063/1.5037405

Publication open access: Other way freely accessible online

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/59772

Web address where publication is available: https://arxiv.org/abs/1804.08319

Abstract

We study the use of a thermoelectric junction as a thermal radiation detector in the calorimetric regime, where single radiation bursts can be separated in time domain. We focus especially on the case of a large thermoelectric figure of merit ZT affecting significantly, for example, the relevant thermal time scales. This work is motivated by the use of hybrid superconductor/ferromagnet systems in creating an unprecedentedly high low-temperature ZT even exceeding unity. Besides constructing a very general noise model which takes into account cross correlations between charge and heat noise, we show how the detector signal can be efficiently multiplexed by the use of resonant LC circuits giving a fingerprint to each pixel. We show that for realistic detectors operating at temperatures around 100 to 200 mK, the energy resolution can be as low as 1 meV. This allows for a broadband single-photon resolution at photon frequencies of the order of or below 1 THz.

Keywords: heat radiation; detectors; superconductors; signal processing; phonons

Free keywords: radiation detectors; telecommunications engineering; inductors; superconducting films; thermodynamic measurements and instrumentation; quasiparticle; ferromagnetic materials

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Ministry reporting: Yes

Reporting Year: 2018

JUFO rating: 1