Inducing anisotropies in Dirac fermions by periodic driving
Abstract
We consider the three-dimensional Hamiltonian for BiSe, a second-generation topological insulator, under the effect of a periodic drive for both in-plane and out-of-plane fields. As it will be shown by means of high-frequency expansions up to second order in the Floquet Hamiltonian, the driving induces anisotropies in the Dirac cone and opens up a quasienergy gap for in-plane elliptically polarized fields. Analytic expressions are obtained for the renormalized velocities and the quasienergy gap. These expressions are then compared to numerical calculations performed by discretizing the Hamiltonian in a one-dimensional lattice and following a staggered fermion approach, achieving a remarkable agreement. We believe our work may have an impact on the transport properties of topological insulators.
Keywords
Cite
@article{arxiv.2005.13351,
title = {Inducing anisotropies in Dirac fermions by periodic driving},
author = {A. Diaz-Fernandez},
journal= {arXiv preprint arXiv:2005.13351},
year = {2020}
}