Superconductor/ferromagnet tunnel junction based thermoelectric bolometer and calorimeter

25 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
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 $1\times10^{-19}\times\sqrt{G_T}\ \ W/\sqrt{Hz}$ [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)

Less than 5 years of experience since completion of Ph.D Y
Student (Ph.D., M.Sc. or B.Sc.) Y

Primary authors

Mr Zhuoran Geng (University of Jyväskylä) Mr Ari Helenius (University of Jyväskylä) Prof. Telo Heikkilä (University of Jyväskylä) Dr Ilari Maasilta (University of Jyvaskyla)

Presentation Materials