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Electronic Compressibility of Magic-Angle Graphene Superlattices

Author(s)
Tomarken, Spencer Louis; Cao, Yuan; Demir, Ahmet; Jarillo-Herrero, Pablo; Ashoori, Raymond
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Abstract
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.
Date issued
2019-07
URI
https://hdl.handle.net/1721.1/127229
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Tomarken, S. L. et al. “Electronic Compressibility of Magic-Angle Graphene Superlattices.” Physical Review Letters, 123, 4 (July 2019): 046601 © 2019 The Author(s)
Version: Final published version
ISSN
2331-7019

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