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Article overview
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Energy gap-opening and Fermi-level tuning in three-dimensional topological Dirac semimetal Na3Bi films | | Huinan Xia
; Wenhao Zhang
; Ying-Shuang Fu
; | | Date: |
14 Dec 2018 | | Abstract: | Three-dimensional topological Dirac semimetal, exemplified by Na3Bi, offer an
alternative system to reach the two-dimensional topological phase through the
quantum confinement effect that can gap out Dirac nodes. Utilizing the
combination of molecular beam epitaxy and scanning tunneling microscopy, we
measure the electronic structure of Na3Bi film with a R3*R3 surface
reconstruction and its modification as a function of the film thickness. The
Fermi energy can be tuned via certain growth process, thus offering an
appropriate way for achieving the charge neutrality. We directly demonstrate
that a band gap of 67 meV is opened down to 4 ML, converting the Dirac
semimetal to a band insulator. By imaging the electronic states with
quasiparticle interference, we resolve the Dirac-cone surface states with
linear dispersion in momentum space on both gapped and gapless Na3Bi films. Our
work opens up the possibility to exploit the distinct electronic properties of
Dirac semimetals, as well as topological phase transitions near the Dirac or
charge neutrality point. | | Source: | arXiv, 1812.5950 | | Services: | Forum | Review | PDF | Favorites | |
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