Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2

By G. Bian, Tay-Rong Chang, Hao Zheng, Saavanth Velury, Su-Yang Xu, Titus Neupert, Ching-Kai Chiu, D. Sanchez, I. Belopolski, N. Alidoust and 6 more. 2015

240 citations recorded by the source corpus.

A topological nodal-line semimetal is a new condensed matter state with one-dimensional bulk nodal lines and two-dimensional drumhead surface bands. Based on first-principles calculations and our effective k . p model, we propose the existence of topological nodal-line fermions in the ternary transition- metal chalcogenide TlTaSe2. The noncentrosymmetric structure and strong spin-orbit coupling give rise to spinful nodal-line bulk states which are protected by a mirror reflection symmetry of this compound. This is remarkably distinguished from other proposed nodal-line semimetals such as Cu3NPb(Zn) in which nodal lines exist only in the limit of vanishing spin-orbit coupling. We show that the drumhead surface states in TlTaSe2, which are associated with the topological nodal lines, exhibit an unconventional chiral spin texture and an exotic Lifshitz transition as a consequence of the linkage among multiple drumhead surface-state pockets.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4078b83c5c3424cbd20b5458e5b1bdf71c4bbd84

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Ashvin Vishwanath
2. N. P. Armitage
3. E. Mele
4. Masatoshi Sato
5. S. Ryu
6. J. C. Teo
7. A. Schnyder
8. Ching-Kai Chiu

In Condensed Matter Physics

1. Ashvin Vishwanath
2. N. P. Armitage
3. E. Mele
4. Ching-Kai Chiu
5. S. Ryu
6. A. Schnyder
7. J. C. Teo
8. Masatoshi Sato

In Materials Chemistry

1. Ashvin Vishwanath
2. N. P. Armitage
3. S. Ryu
4. J. C. Teo
5. A. Schnyder
6. E. Mele
7. Ching-Kai Chiu
8. Masatoshi Sato

Citations in the corpus

• Weyl and Dirac semimetals in three-dimensional solids (2017, background): “They may have been observed in ZrSiS (Neupane et al., 2016; Schoop et al., 2016), PbTaSe2 (Bian et al., 2016a), HfSiS (Takane et al., 2016), and TlTaSe2 (Bian et al., 2016b) via ARPES.”
• Nodal-knot semimetals (2017, unknown): “[45] Guang Bian, Tay-Rong Chang, Hao Zheng, Saavanth Velury, Su-Yang Xu, Titus Neupert, Ching-Kai Chiu, Shin-Ming Huang, Daniel S.”
• Classification of topological quantum matter with symmetries (2015, background): “Weyl line nodes protected by reflection symmetry exist in the band structure of PbTaSe2 (Bian et al., 2016) and TlTaSe2 (Bian et al., 2015).”