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Self-interaction correction to density-functional approximations for many-electron systems
J.P. Perdew and A. Zunger · 1981
Earlier work this paper cites.
Ab initio molecular dynamics for liquid metals
G. Kresse and J. Hafner · 1993
Earlier work this paper cites.
Projector augmented-wave method
P.E. Blochl · 1994
Earlier work this paper cites.

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Then

Projector augmented-wave method
J. et al. Li · 2010
Later among the works it cites.
Fractal landau-level spectra in twisted bilayer graphene
Original
Z. F. Wang, Feng Liu, and M. Y. Chou · 2012
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2019

Moir\'e-less Correlations in ABCA Graphene

Kerelsky, Alexander, Rubio-Verdú, Carmen, Xian, Lede et al.

Understand

Atomically thin van der Waals materials stacked with an interlayer twist have proven to be an excellent platform towards achieving gate-tunable correlated phenomena linked to the formation of flat electronic bands.

In this work we demonstrate the formation of emergent correlated phases in multilayer rhombohedral graphene - a simple material that also exhibits a flat electronic band but without the need of having a moir\'e superlattice induced by twisted van der Waals layers.
We show that two layers of bilayer graphene that are twisted by an arbitrary tiny angle host large (micron-scale) regions of uniform rhombohedral four-layer (ABCA) graphene that can be independently studied.
Scanning tunneling spectroscopy reveals that ABCA graphene hosts an unprecedentedly sharp flat band of 3-5 meV half-width.