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We present the observations of Aharonov-Bohm (AB) oscillations in chemical vapor deposition (CVD)-grown graphene rings via magnetotransport measurements at 4 K under out-of-plane external magnetic fields up to &#x002B;&#x002F;-2.1 T. Incorporating a baseline subtraction of the original conductance data allowed us to observe two-terminal conductance oscillations with a spacing of &#x0394;B AB  of 3.66 to 32.9 mT from the ring with an inner radius of 200 nm and arm-width of 400 nm, and spacing of &#x0394;B AB  from 2.1 mT to 8.2 mT from the ring with an inner radius of 400 nm and an arm-width of 400 nm. The fast-Fourier transform (FFT) data showed AB oscillation periods, with the interval of the  h&#x002F;e  fundamental mode given by 30&#x002F;T to 273&#x002F;T for the ring with the inner radius of 200 nm and arm-width of 400 nm, and 122&#x002F;T to 488&#x002F;T for the ring with the inner radius of 400 nm. The broad spreading of FFT peaks is due to the aspect ratio of the inner radius  r 1   and the width  w  of the ring,  r&#x002F;w  &#x223C; 1. Systematic numerical simulations were performed to elucidate the relation between the AB oscillation frequency and the geometry of the ring. This work shows AB oscillations in CVD-grown graphene rings at an elevated temperature (4 K).

Observations of Aharonov-Bohm Conductance Oscillations in CVD-grown Graphene Rings at 4 K