Observation of Fermi arc surface states in a topological metal
Princeton University · National Taiwan University · +5 more institutions
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Abstract
The topology of the electronic structure of a crystal is manifested in its surface states. Recently, a distinct topological state has been proposed in metals or semimetals whose spin-orbit band structure features three-dimensional Dirac quasiparticles. We used angle-resolved photoemission spectroscopy to experimentally observe a pair of spin-polarized Fermi arc surface states on the surface of the Dirac semimetal Na3Bi at its native chemical potential. Our systematic results collectively identify a topological phase in a gapless material. The observed Fermi arc surface states open research frontiers in fundamental physics and possibly in spintronics.
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18Topics & keywords
Topics
Keywords
- Topological insulator
- Surface states
- Semimetal
- Topology (electrical circuits)
- Surface (topology)
- Dirac (video compression format)
- Physics
- Fermi level
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