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)

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

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 languageEnglish
Article number013509
JournalApplied Physics Letters
Volume123
Issue number1
DOIs
Publication statusPublished - 3 Jul 2023
MoE publication typeA1 Journal article-refereed

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