Abstract
Mobility fluctuations have been observed to influence 1/ƒ 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/ƒ 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/ƒδ 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 |
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Article number | 013509 |
Journal | Applied Physics Letters |
Volume | 123 |
Issue number | 1 |
DOIs | |
Publication status | Published - 3 Jul 2023 |
MoE publication type | A1 Journal article-refereed |
Funding
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.