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127229 |
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|a Tomarken, Spencer Louis
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|a Massachusetts Institute of Technology. Department of Physics
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|a Cao, Yuan
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|a Demir, Ahmet
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|a Jarillo-Herrero, Pablo
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|a Ashoori, Raymond
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|a Electronic Compressibility of Magic-Angle Graphene Superlattices
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|b American Physical Society (APS),
|c 2020-09-10T14:56:10Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/127229
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|a We report the first electronic compressibility measurements of magic-angle twisted bilayer graphene. The evolution of the compressibility with carrier density offers insights into the interaction-driven ground state that have not been accessible in prior transport and tunneling studies. From capacitance measurements, we determine the chemical potential as a function of carrier density and find the widths of the energy gaps at fractional filling of the moiré lattice. In the electron-doped regime, we observe unexpectedly large gaps at quarter- and half-filling and strong electron-hole asymmetry. Moreover, we measure a ∼35 meV minibandwidth that is much wider than most theoretical estimates. Finally, we explore the field dependence up to the quantum Hall regime and observe significant differences from transport measurements.
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|a Gordon and Betty Moore Foundation. Emergent Phenomena in Quantum Systems (EpiQS) initiative (Grant GBMF4541)
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|a National Science Foundation (U.S.) (Grants DMR-1809802, DMR-1231319, DMR-0819762, ECS-0335765)
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|a en
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|a Article
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|t 10.1103/PHYSREVLETT.123.046601
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|t Physical Review Letters
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