Double Fermi arcs in charge-compensated and charge-uncompensated Na<sub>3</sub>Bi slabs.
ORAL
Abstract
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 find that Fermi arcs coexist with trivial surface states even in the higher energy 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).
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 find that Fermi arcs coexist with trivial surface states even in the higher energy 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).
*L.K.W. was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Computational Materials Sciences Program, under Award No. DE-SC0020177. This work made use of the Illinois Campus Cluster, a computing resource that is operated by the Illinois Campus Cluster Program (ICCP) in conjunction with the National Center for Supercomputing Applications (NCSA) and is supported by funds from the University of Illinois at Urbana-Champaign.
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Presenters
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Vasilios Kostas Passias
- University of Illinois at Urbana-Champaign