Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices Polshyn, Hryhoriy ; https://orcid.org/0000-0001-8223-8896 Zhou, H. Spanton, E. M. Taniguchi, T. Watanabe, K. Young, A. F. general physics and astronomy Owing to their wide tunability, multiple internal degrees of freedom, and low disorder, graphene heterostructures are emerging as a promising experimental platform for fractional quantum Hall (FQH) studies. Here, we report FQH thermal activation gap measurements in dual graphite-gated monolayer graphene devices fabricated in an edgeless Corbino geometry. In devices with substrate-induced sublattice splitting, we find a tunable crossover between single- and multicomponent FQH states in the zero energy Landau level. Activation gaps in the single-component regime show excellent agreement with numerical calculations using a single broadening parameter Γ≈7.2K. In the first excited Landau level, in contrast, FQH gaps are strongly influenced by Landau level mixing, and we observe an unexpected valley-ordered state at integer filling ν=−4. American Physical Society 2018 info:eu-repo/semantics/article doc-type:Article Article http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/10626 Polshyn H, Zhou H, Spanton EM, Taniguchi T, Watanabe K, Young AF. Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices. <i>Physical Review Letters</i>. 2018;121(22). doi:<a href="https://doi.org/10.1103/physrevlett.121.226801">10.1103/physrevlett.121.226801</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1103/physrevlett.121.226801 info:eu-repo/semantics/altIdentifier/issn/0031-9007 info:eu-repo/semantics/altIdentifier/e-issn/1079-7114 info:eu-repo/semantics/altIdentifier/arxiv/1805.04199 info:eu-repo/semantics/openAccess