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Recent angle-resolved photoemission spectroscopy experiments and theoretical calculations indicate the existence of multiple Dirac states in the topological material Hf₂Te₂P [1]. In this study we use scanning tunneling spectroscopy (STS) to measure the electronic band structure of the material. Using STS as a direct probe of the real-space local density of states, we identify quasiparticle interference patterns that allow us to measure the topological surface states. The results will be discussed in the context of density functional theory calculations that predict multiple topological states below and above the Fermi energy.

[1]: Hosen et al. Distinct multiple fermionic states in a single topological metal Hf₂Te₂P. Nat. Commun. 9-3002, 2018.