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Owing to their wide tunability, spin- and valley internal degrees of freedom,and low disorder, graphene heterostructures are emerging as a promisingexperimental platform for fractional quantum Hall (FQH) studies. Surprisingly,however, transport measurements reveal many fewer FQH states than bulkcapacitive probes. Here, we report the fabrication of dual graphite-gatedmonolayer graphene devices in an edgeless Corbino-type geometry that showingdeep FQH sequences. Thermal activation gaps reveal a tunable crossover betweensingle- and multi-component FQH states in the zero energy Landau level, whilethe first Landau level is found to host an unexpected valley-ordered state at$\nu=-4$.

Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices