Observation of a Flat and Extended Surface State in a Topological Semimetal
A flat band structure in momentum space is considered key for the realization of novel phenomena. A topological flat band, also known as a drumhead state, is an ideal platform to drive new exotic topological quantum phases. Using angle-resolved photoemission spectroscopy experiments, we reveal the e...
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| Veröffentlicht in: | Materials 2022-04, Vol.15 (8), p.2744 |
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| creator | Mori, Ryo Wang, Kefeng Morimoto, Takahiro Ciocys, Samuel Denlinger, Jonathan D Paglione, Johnpierre Lanzara, Alessandra |
| description | A flat band structure in momentum space is considered key for the realization of novel phenomena. A topological flat band, also known as a drumhead state, 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 surface state in a topological semimetal BaAl4 and provide its full energy and momentum space topology. We find that the observed surface state is 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 imply this class of materials as an experimental realization of drumhead surface states and provide an important reference for future studies of the fundamental physics of correlated quantum effects in topological materials. |
| doi_str_mv | 10.3390/ma15082744 |
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| subjects | Energy flat bands MATERIALS SCIENCE Momentum Phase transitions Photoelectric emission photoemission spectroscopy Spectrum analysis surface states Symmetry topological materials Topology |
| title | Observation of a Flat and Extended Surface State in a Topological Semimetal |
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