TY - GEN
T1 - Aharonov-Bohm Oscillations in CVD-grown Graphene Rings
AU - Tang, Zitao
AU - Chen, Siwei
AU - Sakar, Abdus Salam
AU - Osuala, Cynthia
AU - Strauf, Stefan
AU - Hader, Grzegorz
AU - Chou, Tsengming
AU - Cummings, Aron
AU - Qu, Chunlei
AU - Yang, Eui Hyeok
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
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U2 - 10.1109/NANO58406.2023.10231188
DO - 10.1109/NANO58406.2023.10231188
M3 - Conference contribution
AN - SCOPUS:85172440191
T3 - Proceedings of the IEEE Conference on Nanotechnology
SP - 65
EP - 68
BT - 2023 IEEE 23rd International Conference on Nanotechnology, NANO 2023
T2 - 23rd IEEE International Conference on Nanotechnology, NANO 2023
Y2 - 2 July 2023 through 5 July 2023
ER -