Observation of Surface State Suppression in Magnetic Weyl Semimetal NdAlSi
arxiv(2024)
摘要
Understanding and mastering the control of surface states in topological
materials are crucial steps for the development of future electronic devices
and technologies that leverage the unique properties of these materials. Here,
using angle-resolved photoemission spectroscopy, we provide a good case study
of this by visualizing the electronic structure of a magnetic Weyl semimetal on
both flat and uneven surfaces. Our observations reveal that the preparation of
an uneven sample surface can effectively suppress all surface states in the
Weyl semimetal NdAlSi, including topological surface Fermi arcs. This results
in the observation of pure bulk states devoid of any Fermi energy shift. This
discovery not only opens up a new avenue to directly study the pure bulk states
of a Weyl semimetal using low photon energies in ARPES but also provides key
insights into the control of the surface states in topological materials.
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