Na3Bi is a topological Dirac semimetal [1] initially thought to have double surface Fermi arcs on facets with momentum separated surface projected Dirac points [1-3]. Angle resolved photoemission spectroscopy (ARPES) measurements on Na3Bi's (100) facet [4] are consistent with double surface Fermi arcs [1,2]. However, it was shown that bulk symmetry preserving terms that leave the Dirac points unchanged could deform the double surface Fermi arcs into a closed Fermi contour that does not connect to the Dirac points [5] and could be still consistent with the ARPES data.
I will discuss ongoing work investigating how robust the double surface Fermi arcs are to somewhat realistic modifications of Na3Bi (100) slabs. In doing so, I will explain how we construct the tight binding models of two Na3Bi (100) slabs using pseudo-atomic orbitals [6]. We will examine states near and away from the Dirac points via band and Fermi surface plots of these slabs. Our findings suggest that double surface Fermi arcs may be more robust than previously thought.
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).
6. M. Buongiorno Nardelli, et al, Computational Materials Science 143 (2018).
