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Imaging electronic states on topological semimetals using scanning tunneling microscopy

Author(s): Gyenis, Andras; Inoue, Hiroyuki; Jeon, Sangjun; Zhou, Brian B.; Feldman, Benjamin E.; et al

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Abstract: Following the intense studies on topological insulators, significant efforts have recently been devoted to the search for gapless topological systems. These materials not only broaden the topological classification of matter but also provide a condensed matter realization of various relativistic particles and phenomena previously discussed mainly in high energy physics. Weyl semimetals host massless, chiral, low-energy excitations in the bulk electronic band structure, whereas a symmetry protected pair of Weyl fermions gives rise to massless Dirac fermions. We employed scanning tunneling microscopy/spectroscopy to explore the behavior of electronic states both on the surface and in the bulk of topological semimetal phases. By mapping the quasiparticle interference (QPI) and emerging Landau levels at high magnetic field in Dirac semimetals Cd3As2 and Na3Bi, we observed extended Dirac-like bulk electronic bands. QPI imaged on Weyl semimetal TaAs demonstrated the predicted momentum dependent delocalization of Fermi arc surface states in the vicinity of the surface-projected Weyl nodes.
Publication Date: Oct-2016
Electronic Publication Date: 18-Oct-2016
Citation: Gyenis, Andras, Inoue, Hiroyuki, Jeon, Sangjun, Zhou, Brian B, Feldman, Benjamin E, Wang, Zhijun, Li, Jian, Jiang, Shan, Gibson, Quinn D, Kushwaha, Satya K, Krizan, Jason W, Ni, Ni, Cava, Robert J, Bernevig, B Andrei, Yazdani, Ali. (2016). Imaging electronic states on topological semimetals using scanning tunneling microscopy. NEW JOURNAL OF PHYSICS, 18, doi:10.1088/1367-2630/18/10/105003
DOI: doi:10.1088/1367-2630/18/10/105003
ISSN: 1367-2630
Pages: 1 - 18
Type of Material: Journal Article
Journal/Proceeding Title: NEW JOURNAL OF PHYSICS
Version: Final published version. This is an open access article.

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