Aharonov-Bohm Oscillations in CVD-grown Graphene Rings

2023 IEEE 23RD INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY, NANO(2023)

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摘要
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 Delta B-AB 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 1/T. The broad spread of FFT peaks is due to the relatively large ring width with the aspect ratio of the inner radius r(1) and the width w of the ring, r/w similar to 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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Aharonov-Bohm oscillations,baseline subtraction,C/el,chemical vapour deposition,fast-Fourier transform data,nonsuspended monolayer graphene rings,out-of-plane external magnetic fields,radius 400.0 nm to 800.0 nm,temperature 4.0 K,two-terminal conductance oscillations
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