Na3Bi is a topological Dirac semimetal [1] which can support double surface Fermi arcs [1-3]. Angle resolved photoemission spectroscopy (ARPES) measurements on Na3Bi's (100) facet are consistent with double surface Fermi arcs [4]. However, these arcs are not topologically protected by all symmetry-preserving bulk perturbations [5] or surface effects [2]. It is currently unknown whether realistic perturbations and surfaces can destroy the Fermi arcs.
We consider realistic tight-binding models of Na3Bi derived from first principles calculations. To investigate the effects of realistic surface and bulk conditions, we consider two surface terminations: one which is lower energy and charge-compensated, likely representative of experimental conditions, and one that is higher energy and charge-uncompensated with trivial surface states. We found double surface Fermi arcs in both slabs and loops in the charge uncompensated slab’s Fermi surface.
1. Z. Wang, et al, Phys. Rev. B 85, 195320 (2012).
2. A. C. Potter, I. Kimchi, and A. Vishwanath, Nature Communications 5, 5161 (2014).
3. E. V. Gorbar, V. A. Miransky, I. A. Shovkovy, and P. O. Sukhachov, Phys. Rev. B 91, 121101 (2015).
4. S.-Y. Xu, et al, Science 347 (2015).
5. M. Kargarian, M. Randeria, and Y.-M. Lu, Proceedings of the National Academy of Sciences 113 (2016).
