2007/11/09 by Saverio Russo, Jeroen B. Oostinga, Dominique Wehenkel +5 · 8 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Aharonov–Bohm effect #Amplitude #Chemistry #Coherence (philosophical gambling strategy) #Condensed matter physics #Conductance #Cyclotron #Graphene #Graphene research and applications #Magnetic field #Molecular Junctions and Nanostructures #Oscillation (cell signaling) #Physics #Quantum and electron transport phenomena #Quantum mechanics #Ring (chemistry) #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.77.085413
published as Phys. Rev. B 77, 085413 (2010) · 14 pages, 5 figures
arxiv created 2007/11/09 · openalex publication_date 2008/02/12 · arxiv updated 2010/10/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate experimentally transport through ring-shaped devices etched in graphene and observe clear Aharonov-Bohm conductance oscillations. The temperature dependence of the oscillation amplitude indicates that below 1\phantom\rule0.3em0exK, the phase coherence length is comparable to or larger than the size of the ring. An increase in the amplitude is observed at high magnetic field, when the cyclotron diameter becomes comparable to the width of the arms of the ring. By measuring the dependence on gate voltage, we find that the Aharonov-Bohm effect vanishes at the charge neutrality point, and we observe an unexpected linear dependence of the oscillation amplitude on the ring conductance.