Observation of Fermi arc surface states in a topological metal

Su Yang Xu, Chang Liu, Satya K. Kushwaha, Raman Sankar, Jason W. Krizan, Ilya Belopolski, Madhab Neupane, Guang Bian, Nasser Alidoust, Tay Rong Chang, Horng Tay Jeng, Cheng Yi Huang, Wei Feng Tsai, Hsin Lin, Pavel P. Shibayev, Fang Cheng Chou, Robert J. Cava, M. Zahid Hasan

Research output: Contribution to journalArticlepeer-review

472 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)294-298
Number of pages5
JournalScience
Volume347
Issue number6219
DOIs
StatePublished - Jan 16 2015

All Science Journal Classification (ASJC) codes

  • General

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