Aharonov-Bohm Oscillations in CVD-grown Graphene Rings

Zitao Tang, Siwei Chen, Abdus Salam Sakar, Cynthia Osuala, Stefan Strauf, Grzegorz Hader, Tsengming Chou, Aron Cummings, Chunlei Qu, Eui Hyeok Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This paper presents Aharonov-Bohm (AB) oscillations in CVD-grown graphene rings. We fabricated graphene rings and characterized their conductance at 4 K under out-of-plane external magnetic fields up to +/-5.6T. Incorporating a baseline subtraction of the original conductance data enabled the observation of two-terminal conductance oscillations with a spacing of ABAB from 2.06 mT to 8.2mT, as expected for an ideal ring with a range of radii from 400 nm to 800 nm. The Fast-Fourier Transform (FFT) data showed a broad band of AB oscillation frequencies that constitute the interval of the h/e fundamental mode given by the sample geometry ranging from 122 to 488 l/T. The broad spread of FFT peaks is due to the relatively large ring width with the aspect ratio of the inner radius r1 and the width w of the ring, r/w\∼ 1. The overall AB oscillations were comparable to the theoretical prediction. This work shows the AB oscillations at a significantly higher temperature (4K) despite the lower mobility of non-suspended monolayer graphene rings.

Original languageEnglish
Title of host publication2023 IEEE 23rd International Conference on Nanotechnology, NANO 2023
Pages65-68
Number of pages4
ISBN (Electronic)9798350333466
DOIs
StatePublished - 2023
Event23rd IEEE International Conference on Nanotechnology, NANO 2023 - Jeju City, Korea, Republic of
Duration: 2 Jul 20235 Jul 2023

Publication series

NameProceedings of the IEEE Conference on Nanotechnology
Volume2023-July
ISSN (Print)1944-9399
ISSN (Electronic)1944-9380

Conference

Conference23rd IEEE International Conference on Nanotechnology, NANO 2023
Country/TerritoryKorea, Republic of
CityJeju City
Period2/07/235/07/23

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