Electronic Compressibility of Magic-Angle Graphene Superlattices

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 capacit...

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Veröffentlicht in:	Physical review letters 2019-07, Vol.123 (4), p.046601-046601, Article 046601
Hauptverfasser:	Tomarken, S L, Cao, Y, Demir, A, Watanabe, K, Taniguchi, T, Jarillo-Herrero, P, Ashoori, R C
Format:	Artikel
Sprache:	eng
Schlagworte:	Bilayers Carrier density Chemical potential Compressibility Dependence Energy gap Graphene Holes (electron deficiencies) Organic chemistry Superlattices Transport
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creator	Tomarken, S L Cao, Y Demir, A Watanabe, K Taniguchi, T Jarillo-Herrero, P Ashoori, R C
description	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.
doi_str_mv	10.1103/PhysRevLett.123.046601
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subjects	Bilayers Carrier density Chemical potential Compressibility Dependence Energy gap Graphene Holes (electron deficiencies) Organic chemistry Superlattices Transport
title	Electronic Compressibility of Magic-Angle Graphene Superlattices
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