18th International Workshop on Low Temperature Detectors (LTD-18)

Superconductor/ferromagnet tunnel junction based thermoelectric bolometer and calorimeter

25 Jul 2019, 17:45

1h 15m

Piazza Città di Lombardia (Milano)

Poster Low Temperature Detector Development and Physics Poster session

Speaker

Mr Zhuoran Geng (University of Jyväskylä)

Description

Based on the giant thermoelectric effect of a superconductor/ferromagnet tunnel junction [1], a novel ultrasensitive radiation detector (SFTED) has been proposed both as bolometer [2] and calorimeter [3]. This type of detector can be operated without the need of additional circuit lines for the sensing bias, and at the same time providing a noise equivalent power (NEP) below $1\times {10}^{-19}\times \sqrt{G_T}W/\sqrt{Hz}$ [2] ($\sqrt{G_T}$ is the tunneling conductance of the junction), rivaling the best TES and KID detectors, in theory. Here we report our recent numerical studies on the feasibility of a SQUID readout of SFTED in both bolometric and calorimetric regimes, and in the direction of providing a set of practical design parameters for the detector fabrication and the readout circuitry implementation.
[1]. A. Ozaeta, et al., Phys. Rev. Lett., 112, 057001 (2014)
[2]. T.T. Heikkilä, et al., Phys. Rev. Appl., 10, 034053 (2018)
[3]. S. Chakraborty and T.T. Heikkilä, J. Appl. Phys., 14 123902 (2018)

Presentation materials

poster.pdf