article published yes Hryhoriy Polshyn author edfc7cb1-526e-11ec-b05a-e6ecc27e4e480000-0001-8223-8896 H. Zhou author E. M. Spanton author T. Taniguchi author K. Watanabe author A. F. Young author 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 Society2018 eng general physics and astronomy 0031-9007 1079-7114 1805.0419910.1103/physrevlett.121.226801 12122 yes 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> Polshyn, Hryhoriy, et al. “Quantitative Transport Measurements of Fractional Quantum Hall Energy Gaps in Edgeless Graphene Devices.” <i>Physical Review Letters</i>, vol. 121, no. 22, 226801, American Physical Society, 2018, doi:<a href="https://doi.org/10.1103/physrevlett.121.226801">10.1103/physrevlett.121.226801</a>. Polshyn H, Zhou H, Spanton EM, Taniguchi T, Watanabe K, Young AF. 2018. Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices. Physical Review Letters. 121(22), 226801. H. Polshyn, H. Zhou, E.M. Spanton, T. Taniguchi, K. Watanabe, A.F. Young, Physical Review Letters 121 (2018). Polshyn, Hryhoriy, H. Zhou, E. M. Spanton, T. Taniguchi, K. Watanabe, and A. F. Young. “Quantitative Transport Measurements of Fractional Quantum Hall Energy Gaps in Edgeless Graphene Devices.” <i>Physical Review Letters</i>. American Physical Society, 2018. <a href="https://doi.org/10.1103/physrevlett.121.226801">https://doi.org/10.1103/physrevlett.121.226801</a>. Polshyn, H., Zhou, H., Spanton, E. M., Taniguchi, T., Watanabe, K., &#38; Young, A. F. (2018). Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices. <i>Physical Review Letters</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevlett.121.226801">https://doi.org/10.1103/physrevlett.121.226801</a> H. Polshyn, H. Zhou, E. M. Spanton, T. Taniguchi, K. Watanabe, and A. F. Young, “Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices,” <i>Physical Review Letters</i>, vol. 121, no. 22. American Physical Society, 2018. 106262022-01-14T12:15:47Z2022-01-14T13:48:35Z