Imaging electronic states on topological semimetals using scanning tunneling microscopy

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 and emerging Landau levels at high magnetic field in Dirac semimetals Cd${}_3$As${}_2$ and Na${}_3$Bi, we observed extended Dirac-like bulk electronic bands. Quasiparticle interference 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.

References in corpus (8)

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• Topological response in Weyl semimetals and the chiral anomaly
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• Weyl semimetals from noncentrosymmetric topological insulators
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Cited by in corpus (11)

• Topological Materials Discovery from Crystal Symmetry
• Probing topological quantum matter with scanning tunnelling microscopy
• Hydrodynamics of Fermi arcs: Bulk flow and surface collective modes
• Intrinsic surface superconducting instability in Type-I Weyl Semimetals
• Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi
• Surface Luttinger arcs in Weyl semimetals
• Multiplicative topological semimetals
• Finite-size topological phases from semimetals
• Anomalous Surface Conductivity of Weyl Semimetals
• Superconductor Vortex Spectrum Including Fermi Arc States in Time-Reversal Symmetric Weyl Semimetals
• Vortical effects in chiral band structures