2020 EJRNL PP LUKAS MUECHLE 1.pdf?
Terbatas Ratnasari
» ITB
Terbatas Ratnasari
» ITB
We study the electronic structure of the nodal line semimetal ZrSiTe both experimentally and
theoretically. We find two different surface states in ZrSiTe—topological drumhead surface states and
trivial floating band surface states, which can be easily distinguished in ARPES experiments. Using the
spectra of Wilson loops, we show that a nontrivial Berry phase that exists in a confined region within the
Brillouin zone gives rise to the topological drumhead-type surface states. The Z2 structure of the Berry
phase induces a Z2 “modular arithmetic” of the surface states, allowing surface states derived from different nodal lines to hybridize and gap out, which can be probed by a set of Wilson loops. Our findings are confirmed by ab initio calculations and angle-resolved photoemission experiments, which are in excellent agreement with each other and the topological analysis. This work is the first complete characterization of topological surface states in the family of square-net-based nodal line semimetals, and thus it fundamentally increases the understanding of the topological nature of this growing class of topological semimetals.