Shubnikov–de Haas and Aharonov Bohm effects in a graphene nanoring structure

Jai Seung Yoo; Yung Woo Park; Skákalová, Viera; Roth, Siegmar
April 2010
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p143112
Academic Journal
We observed the Shubnikov–de Haas and the Aharonov Bohm oscillations in a graphene nanoring structure of 1 μm in diameter and with a 125 nm channel width. We found a separation of 2ΔVg=17.5 V between electron and hole Landau levels in the plot of longitudinal resistance as a function of gate voltage and magnetic field. This separation can be understood as a result of the transport gap, ΔVt=20 V, in the density of state. The Aharonov Bohm effect was observed in magnetoconductance with poor visibility because of the short phase coherence length of the graphene nanoring structure.


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