Twistronics in graphene-based van der Waals structures

Abstract

The electronic properties of van der Waals (vdW) structures can be\nsubstantially modified by the moire superlattice potential, which strongly\ndepends on the twist angle among the compounds. In twisted bilayer graphene\n(TBG), two low-energy Van Hove singularities (VHSs) move closer with decreasing\ntwist angles and finally become highly non-dispersive flat bands at the magic\nangle (~ 1.1 degree). When the Fermi level lies within the flat bands of the\nTBG near the magic angle, Coulomb interaction is supposed to exceed the kinetic\nenergy of the electrons, which can drive the system into various strongly\ncorrelated phases. Moreover, the strongly correlated states of flat bands are\nalso realized in other graphene-based vdW structures with an interlayer twist.\nIn this article, we mainly review the recent experimental advances on the\nstrongly correlated physics of the magic-angle TBG (MATBG) and the small-angle\ntwisted multilayer graphene. Lastly we will give out a perspective of this\nfield.\n