Wideband detection of electromagnetic signals by high- T c Josephson junctions with comparable Josephson and thermal energies

Pavlovskiy, V. V.; Volkov, O. Y.; Gundareva, I. I.; Divin, Y. Y.

doi:10.1063/1.5142400

Journal Article

FZJ-2020-01387

Wideband detection of electromagnetic signals by high- T c Josephson junctions with comparable Josephson and thermal energies

Pavlovskiy, V. V. ; Gundareva, I. I.FZJ* ; Volkov, O. Y. ; Divin, Y. Y. (Corresponding author)FZJ*

2020
American Inst. of Physics Melville, NY

Applied physics letters 116(8), 082601 - (2020) [10.1063/1.5142400]

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Please use a persistent id in citations: http://hdl.handle.net/2128/24467 doi:10.1063/1.5142400

Abstract: Detection mechanisms in Josephson junctions with energies Ej comparable to thermal energies kT have been studied. The responses ΔV of YBa2Cu3O7−x bicrystal junctions to monochromatic radiation with frequencies f ranging from 94 GHz to 3.1 THz can be described in terms of classical rectification on a static nonlinear V–I curve at low frequencies and frequency modulation of the ac Josephson current at high frequencies, with an interplay between these mechanisms at intermediate frequencies. An electrical noise-equivalent power of (9 ± 3) × 10−15 W/Hz1/2, a responsivity of (3.4 ± 0.5) × 105 V/W, and a dynamic power range of 5 × 104 have been demonstrated for the square-law classical detection of 94 GHz radiation with the junctions at 50 K. The effect of background radiation on the V–I curves of YBa2Cu3O7−x bicrystal junctions was found to have an optical noise-equivalent temperature of ≤30 mK/Hz1/2. The main contribution to the effect comes from the interplay between the classical and Josephson detection mechanisms. The spectral and power dependencies of the responses ΔV of Josephson junctions have been numerically simulated within the resistively shunted junction model at various values of kT/Ej, and the results are in acceptable agreement with the experimental data.

Classification:

ddc:530

Contributing Institute(s):

Mikrostrukturforschung (PGI-5)

Research Program(s):

144 - Controlling Collective States (POF3-144) (POF3-144)

Appears in the scientific report 2020

Database coverage:
Medline

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