Effective field theory for the bulkedge correspondence in a twodimensional Z_{2} topological insulator with Rashba interactions
Abstract
We determine the effective field theory in (2+1)dimensional space and time so that it captures the longwavelength and lowenergy limit of fermions hopping on a honeycomb lattice at halffilling when both dominant intrinsic and subdominant Rashba spinorbit couplings are present. This effective field theory for a Z_{2} topological insulator (the KaneMele model at vanishing uniform and staggered chemical potentials) is a perturbation around a double ChernSimons theory, with the U(1) gauge invariance associated with spin conservation explicitly broken due to the Rashba spinorbit coupling. Nonetheless, we find that the effective field theory has a BecchiRouetStoraTyutin symmetry that allows us to construct the bulkedge correspondence.
 Publication:

Physical Review B
 Pub Date:
 September 2014
 DOI:
 10.1103/PhysRevB.90.115144
 arXiv:
 arXiv:1407.2633
 Bibcode:
 2014PhRvB..90k5144G
 Keywords:

 71.10.w;
 Theories and models of manyelectron systems;
 Condensed Matter  Strongly Correlated Electrons;
 High Energy Physics  Theory
 EPrint:
 16 pages, 8 figures