Kavli Affiliate: Alessandra Lanzara
| First 5 Authors: Ryo Mori, Kefeng Wang, Takahiro Morimoto, Jonathan D. Denlinger, Johnpierre Paglione
| Summary:
A topological flatband, also known as drumhead states, is an ideal platform
to drive new exotic topological quantum phases. Using angle-resolved
photoemission spectroscopy experiments, we reveal the emergence of a highly
localized possible drumhead surface state in a topological semimetal BaAl4 and
provide its full energy and momentum space topology. We find that the observed
surface state is highly localized in momentum, inside a square-shaped bulk
Dirac nodal loop, and in energy, leading to a flat band and a peak in the
density of state. These results establish this class of materials as a possible
experimental realization of drumhead surface states and provide an important
reference for future studies of fundamental physics of topological quantum
phase transition.
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