Deformation induced pseudomagnetic fields in complex carbon architectures

[摘要] We show that the physics of deformation in alpha-, beta-, 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 pseudomagnetic fields. To show this, we develop a continuum theory of deformation in these materials, and consider two versions of this theory: (i) a truncated theory describing only the low-energy degrees of freedom of the conical intersection, which thus is spinor valued as in graphene, and (ii) one describing the full sublattice 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.

[关键词] TOTAL-ENERGY CALCULATIONS;ELECTRONIC-PROPERTIES;GRAPHYNE;GRAPHENE;ALLOTROPES;GRAPHDIYNE