Imaging electronic states on topological semimetals using scanning tunneling microscopy

András Gyenis, Hiroyuki Inoue, Sangjun Jeon, Brian B. Zhou, Benjamin E. Feldman, Zhijun Wang, Jian Li, Shan Jiang, Quinn D. Gibson, Satya K. Kushwaha, Jason W. Krizan, Ni Ni, Robert J. Cava, B. Andrei Bernevig, Ali Yazdani

Research output: Contribution to journalArticle

11 Scopus citations

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.

Original languageEnglish (US)
Article number105003
JournalNew Journal of Physics
Volume18
Issue number10
DOIs
StatePublished - Oct 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Landau level spectroscopy
  • quasiparticle interference
  • scanning tunneling spectroscopy
  • topological semimetals

Fingerprint Dive into the research topics of 'Imaging electronic states on topological semimetals using scanning tunneling microscopy'. Together they form a unique fingerprint.

Cite this