Deformation induced pseudomagnetic fields in complex carbon architectures

Abstract

We show that the physics of deformation in α-, β-, and 6, 6, 12-graphyne is, despite their significantly more complex lattice structures, remarkably close to that of graphene, with inhomogeneously strained graphyne described at low energies by an emergent Dirac-Weyl equation augmented by strain induced electric and pseudo-magnetic fields. To show this we develop two continuum theories of deformation in these materials: one that describes the low energy degrees of freedom of the conical intersection, and is spinor valued as in graphene, and one describing the full sub-lattice space. The spinor valued continuum theory agrees very well with the full continuum theory at low energies, showing that the remarkable physics of deformation in graphene generalizes to these more complex carbon architectures. In particular, we find that deformation induced pseudospin polarization and valley current loops, key phenomena in the deformation physics of graphene, both have their counterpart in these more complex carbon materials. arXiv:1904.11257v1 [cond-mat.mtrl-sci]

A general relation between stacking order and Chern index: a topological map of minimally twisted bilayer graphene

“…For further details we refer the reader to Ref. 20 as well as several applications of the method: to minimally twisted bilayer graphene 18 , partial dislocation networks [21][22][23] , and in-plane deformation fields 24,25 .…”