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Title: Imaging electronic states on topological semimetals using scanning tunneling microscopy

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.Weemployed 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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [2] ;  [3] ;  [1] ;  [1]
  1. Princeton Univ., NJ (United States). Joseph Henry Lab. of Physics
  2. Univ. of California, Los Angeles, CA (United States). California NanoSystems Inst., Dept. of Physics and Astronomy
  3. Princeton Univ., NJ (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
SC0011978; SC0016239; FG02-05ER46200
Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 10; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Univ. of California, Los Angeles, CA (United States); Princeton Univ., NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Secretary of Energy (S)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; topological semimetals; scanning tunneling spectroscopy; quasiparticle interference; Landau level spectroscopy
OSTI Identifier:
1329265
Alternate Identifier(s):
OSTI ID: 1329266; OSTI ID: 1374812