Transport Properties of a Few-layer Rhombohedral-stacked Graphene

Recently, two-dimensional systems that host flat bands have been extensively investigated experimentally and theoretically, due to the intriguing correlation effects as a result of large density of states. In a few-layer rhombohedral-stacked graphene, the dispersionless flat band localised at the outer surfaces is a promising candidate to realise such strong correlation physics. In this talk, I will present our preliminary data on the electrical transport in a few-layer rhombohedral-stacked graphene. We found that a gap is opened at the surfaces when a displacement field exceeds a threshold value. In a magnetic field we found robust quantum oscillations suggesting the high electronic quality of the observed flat-band surface states.