We show that the inclusion of nonlocal correlation effects in a variational wave function for the ground state of a topological Anderson lattice Hamiltonian is capable of describing both topologically trivial insulating phases and nontrivial ones characterized by an indirect gap, as well as its closure at the transition into a metallic phase. The method, though applied to an oversimplified model, thus captures the metallic and insulating states that are indeed observed in a variety of Kondo semiconductors, while accounting for topologically nontrivial band structures.
@article{arxiv.1605.08865,
title = {Many-body breakdown of indirect gap in topological Kondo insulators},
author = {Marcin M. Wysokinski and Michele Fabrizio},
journal= {arXiv preprint arXiv:1605.08865},
year = {2016}
}