Doubled Moiré Flat Bands in Double-twisted Few Layer Graphite

Abstract

We study the electronic structure of a double-twisted few layer graphite (DTFLG), which consists of three few layer graphite (FLG), i.e. ABA-stacked graphene multilayer, stacked with two twist angles. We consider two categories of DTFLG, alternately twisted case and chirally twisted one, according to the rotation direction of the two twist angles. We show that, once the middle FLG of DTFLG is not thinner than trilayer, both kinds of DTFLG can remarkably host two pairs of degenerate moiré flat bands (MFBs) at $E_f$, twice that of the magic angle twisted bilayer graphene (TBG). The doubled MFBs of DTFLG lead to doubled DOS at $E_f$, which implies much stronger correlation effects than the TBG. The degeneracy of MFBs can be lifted by a perpendicular electric field, and the isolated MFBs have nonzero valley Chern number. We also reveal the peculiar wave function patterns of the MFBs in the DTFLG. Our results establish a new family of moiré systems that have the much larger DOS at $E_f$, and thus possible much stronger correlation effects.

6 pages, 4 figures

References in corpus (13)

• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Continuum Model of the Twisted Bilayer
• Flatbands in twisted double bilayer graphene
• Band structure and topological property of twisted double bilayer graphenes
• Flat bands and perfect metal in trilayer moiré graphene
• Electronic Properties of Twisted Trilayer Graphene
• Double moiré with a twist: super-moiré in encapsulated graphene
• Mirror Symmetry Breaking and Lateral Stacking Shifts in Twisted Trilayer Graphene
• Topological charge pumping by sliding moiré pattern
• Lattice relaxation, mirror symmetry and magnetic field effects on ultraflat bands in twisted trilayer graphene
• Stacking and gate tunable topological flat bands, gaps and anisotropic strip patterns in twisted trilayer graphene
• Alternating twisted mutilayer graphene: generic partition rules, double flat bands, and orbital magnetoelectric effect
• Moire Band Structures of the Double twisted Few Layer Graphene

Cited by in corpus (6)

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• Intrinsically-multilayer moiré heterostructures
• Moir{é} pattern assisted geometric resonant tunneling in disordered twisted bilayer graphene
• Moiré Band Engineering in Twisted Trilayer WSe2
• Topological Floquet Flat Bands in Irradiated Alternating Twist Multilayer Graphene