Optically-Controlled Orbitronics on a Triangular Lattice
Abstract
The propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally-induced Berry curvature. In striking contrast to the related situation in graphene, we find that anomalous transport for an multiplet on the primitive 2D triangular lattice is activated by easily implemented on-site and optically-tunable potentials. We demonstrate this for dynamics in a Bloch band where point degeneracies carrying opposite winding numbers are generically offset in energy, allowing both an anomalous charge Hall conductance with sign selected by off-resonance coupling to circularly-polarized light and a related anomalous orbital Hall conductance activated by layer buckling.
Cite
@article{arxiv.1809.09598,
title = {Optically-Controlled Orbitronics on a Triangular Lattice},
author = {Vo Tien Phong and Zachariah Addison and Seongjin Ahn and Hongki Min and Ritesh Agarwal and E. J. Mele},
journal= {arXiv preprint arXiv:1809.09598},
year = {2019}
}
Comments
5 + 4 pages, 4 + 1 figures, version accepted to Physical Review Letters