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.

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• Spin polarization and texture of the Fermi arcs in the Weyl Fermion semimetal TaAs
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Cited by in corpus (19)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Materials Discovery from Crystal Symmetry
• Probing topological quantum matter with scanning tunnelling microscopy
• Quasiparticle interference on type-I and type-II Weyl semimetal surfaces: a review
• Hydrodynamics of Fermi arcs: Bulk flow and surface collective modes
• Transport signatures of surface states in a Weyl semimetal: evidence of field driven Fermi arc interferometry
• Intrinsic surface superconducting instability in Type-I Weyl Semimetals
• Fermi arcs and DC transport in nanowires of Dirac and Weyl semimetals
• Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi
• Surface Green's functions and quasiparticle interference in Weyl semimetals
• Dynamical density and spin response of Fermi arcs and their consequences for Weyl semimetals
• Selection rules for quasiparticle interference with internal nonsymmorphic symmetries
• Finite-size topological phases from semimetals
• Multiplicative topological semimetals
• Surface Luttinger arcs in Weyl semimetals
• Systematic analysis for triple points in all magnetic symmorphic systems and symmetry-allowed coexistence of Dirac points and triple points
• 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