Second spectrum of 1 / f noise due to mobility fluctuations : Simulations vs experiments in suspended graphene

Weijun Zeng; Kirsi Tappura; Masahiro Kamada; Antti Laitinen; Heikki Seppä; Pertti Hakonen

doi:10.1063/5.0153467

Second spectrum of 1 / f noise due to mobility fluctuations : Simulations vs experiments in suspended graphene

Weijun Zeng, Kirsi Tappura, Masahiro Kamada, Antti Laitinen, Heikki Seppä, Pertti Hakonen^*

^*Corresponding author for this work

VTT Technical Research Centre of Finland

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Abstract

Mobility fluctuations have been observed to influence 1 / f noise in mesoscopic two-dimensional conductors in recent experiments. If such mobility noise can be assigned to clustering/declustering of defects/impurities, the second spectrum should also display 1 / f character. In this work, we investigate the second spectrum of noise due to mobile impurities on a two-dimensional lattice both using kinetic Monte Carlo simulations (periodic boundary conditions either in one or two directions) and experiments on suspended graphene in Corbino geometry. The simulations indicate 1 / f δ behavior with δ ≃ 0.8 ± 0.15 for the second spectrum of noise, while the experiments on suspended graphene yield an exponent δ ≃ 0.7 ± 0.3 , independent of the amount of adsorbed atoms.

Original language	English
Article number	013509
Pages (from-to)	1-6
Number of pages	6
Journal	Applied Physics Letters
Volume	123
Issue number	1
DOIs	https://doi.org/10.1063/5.0153467
Publication status	Published - 3 Jul 2023
MoE publication type	A1 Journal article-refereed

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10.1063/5.0153467

Second spectrum of 1_f noise due to mobility fluctuationsFinal published version, 1.58 MBLicence: CC BY

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title = "Second spectrum of 1 / f noise due to mobility fluctuations : Simulations vs experiments in suspended graphene",

abstract = "Mobility fluctuations have been observed to influence 1 / f noise in mesoscopic two-dimensional conductors in recent experiments. If such mobility noise can be assigned to clustering/declustering of defects/impurities, the second spectrum should also display 1 / f character. In this work, we investigate the second spectrum of noise due to mobile impurities on a two-dimensional lattice both using kinetic Monte Carlo simulations (periodic boundary conditions either in one or two directions) and experiments on suspended graphene in Corbino geometry. The simulations indicate 1 / f δ behavior with δ ≃ 0.8 ± 0.15 for the second spectrum of noise, while the experiments on suspended graphene yield an exponent δ ≃ 0.7 ± 0.3 , independent of the amount of adsorbed atoms.",

author = "Weijun Zeng and Kirsi Tappura and Masahiro Kamada and Antti Laitinen and Heikki Sepp{\"a} and Pertti Hakonen",

note = "Funding Information: We are grateful to Elisabetta Paladino, Christian Flindt, and Manohar Kumar for helpful comments. This work was supported by the Academy of Finland Project Nos. 310086 (LTnoise), 310087 (LTnoise) and 312295 (CoE, Quantum Technology Finland) as well as by ERC (Grant No. 670743). The research leading to these results has received funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement No. 824109. The experimental work benefited from the Aalto University OtaNano/LTL infrastructure. | openaire: EC/H2020/670743/EU//QuDeT | openaire: EC/H2020/824109/EU//EMP ",

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AU - Zeng, Weijun

AU - Tappura, Kirsi

AU - Kamada, Masahiro

AU - Laitinen, Antti

AU - Seppä, Heikki

AU - Hakonen, Pertti

N1 - Funding Information: We are grateful to Elisabetta Paladino, Christian Flindt, and Manohar Kumar for helpful comments. This work was supported by the Academy of Finland Project Nos. 310086 (LTnoise), 310087 (LTnoise) and 312295 (CoE, Quantum Technology Finland) as well as by ERC (Grant No. 670743). The research leading to these results has received funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement No. 824109. The experimental work benefited from the Aalto University OtaNano/LTL infrastructure. | openaire: EC/H2020/670743/EU//QuDeT | openaire: EC/H2020/824109/EU//EMP

PY - 2023/7/3

Y1 - 2023/7/3

N2 - Mobility fluctuations have been observed to influence 1 / f noise in mesoscopic two-dimensional conductors in recent experiments. If such mobility noise can be assigned to clustering/declustering of defects/impurities, the second spectrum should also display 1 / f character. In this work, we investigate the second spectrum of noise due to mobile impurities on a two-dimensional lattice both using kinetic Monte Carlo simulations (periodic boundary conditions either in one or two directions) and experiments on suspended graphene in Corbino geometry. The simulations indicate 1 / f δ behavior with δ ≃ 0.8 ± 0.15 for the second spectrum of noise, while the experiments on suspended graphene yield an exponent δ ≃ 0.7 ± 0.3 , independent of the amount of adsorbed atoms.

AB - Mobility fluctuations have been observed to influence 1 / f noise in mesoscopic two-dimensional conductors in recent experiments. If such mobility noise can be assigned to clustering/declustering of defects/impurities, the second spectrum should also display 1 / f character. In this work, we investigate the second spectrum of noise due to mobile impurities on a two-dimensional lattice both using kinetic Monte Carlo simulations (periodic boundary conditions either in one or two directions) and experiments on suspended graphene in Corbino geometry. The simulations indicate 1 / f δ behavior with δ ≃ 0.8 ± 0.15 for the second spectrum of noise, while the experiments on suspended graphene yield an exponent δ ≃ 0.7 ± 0.3 , independent of the amount of adsorbed atoms.

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Second spectrum of 1 / f noise due to mobility fluctuations : Simulations vs experiments in suspended graphene

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-: European Microkelvin Platform

Finnish Centre of Excellence in Quantum Technology

1/f noise

OtaNano

OtaNano – Low Temperature Laboratory

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Second spectrum of 1 / f noise due to mobility fluctuations : Simulations vs experiments in suspended graphene

Abstract

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-: European Microkelvin Platform

Finnish Centre of Excellence in Quantum Technology

1/f noise

Equipment

OtaNano

OtaNano – Low Temperature Laboratory

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