Projects per year
Abstract
We have studied 1/f noise in critical current Ic in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to ≃ 5 nA. The low frequency noise in the superconducting state is measured by tracking the variation in magnitude and phase of a reflection carrier signal vrf at 600–650 MHz. We find 1/f critical current fluctuations on the order of δIc/ Ic≃ 10 - 3 per unit band at 1 Hz. The noise power spectrum of critical current fluctuations SIc measured near the Dirac point at large, sub-critical rf-carrier amplitudes obeys the law SIc/Ic2=a/fβ where a≃ 4 × 10 - 6 and β≃ 1 at f> 0.1 Hz. Our results point towards significant fluctuations in Ic originating from variation of the proximity induced gap in the graphene junction.
Original language | English |
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Article number | 19900 |
Number of pages | 10 |
Journal | Scientific Reports |
Volume | 11 |
Issue number | 1 |
DOIs | |
Publication status | Published - 6 Oct 2021 |
MoE publication type | A1 Journal article-refereed |
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Critical current fluctuations in graphene Josephson junctions.
Haque, M. T. (Creator), Will, M. (Creator), Tomi, M. (Creator), Pandey, P. (Creator), Kumar, M. (Creator), Schmidt, F. (Creator), Watanabe, K. (Creator), Taniguchi, T. (Creator), Danneau, R. (Creator), Steele, G. (Creator) & Hakonen, P. (Creator), Zenodo, 2022
Dataset
Projects
- 4 Finished
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GrapheneCore2: Graphene Flagship Core Project 2
Lipsanen, H. (Principal investigator)
01/04/2018 → 31/03/2020
Project: EU: Framework programmes funding
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BOLOSO: Ultrasensitive bolometers for security applications
Hakonen, P. (Principal investigator)
01/01/2018 → 31/08/2022
Project: Academy of Finland: Other research funding
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1/f noise
Hakonen, P. (Principal investigator)
01/09/2017 → 31/08/2021
Project: Academy of Finland: Other research funding
Equipment
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OtaNano – Low Temperature Laboratory
Savin, A. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility