Journal
NANO LETTERS
Volume 17, Issue 12, Pages 7213-7217Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02307
Keywords
Dirac line node semimetal; low-temperature scanning tunneling microscopy; quasiparticle interference spectroscopy; FT-STS; topological phases of matter
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Funding
- East Asia and Pacific Summer Institute of the National Science Foundation
- Australian Academy of Sciences
- National Science Foundation [0955625]
- Australian Research Council DECRA fellowship
- Singapore National Research Foundation (NRF) Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0955625] Funding Source: National Science Foundation
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3D Dirac semimetals are an. emerging class of materials that possess topological electronic states with a Dirac dispersion in their bulk. In nodal-line Dirac sethimetalS, the conductance and Valenee,bands connect along a closed path in momentum space, Jeading to the prediction of pseudospin vortex rings and pseudospin, skyrmions; Here, we use Fourier transform scanning tunneling spectroscopy (FT-STS) at 4.5 K to resolve quasiparticle interference (QPI) patterns rat single defect centers on the surface of the line, nodal semimetal zirconiumsilicon sulfide (ZrSiS). Our QPI measurements show pseudospin conservation at energies close to the line node. In addition, we determine the Fermi velocity to be hv(F) = 2.65 +/- 0.10 eV angstrom in the Gamma-M direction similar to 300 meV above the Fermi energy EF 40 meV above EF. More importantly, we find that certain scatterers can, introduce energy -dependent nonpreservation of pseudospin, giving rise to effective scattering between states with opposite pseudospin deep inside' valence and conduction bands. Further investigations of quasiparticle interference at the atomic level will aid defect engineering at the synthesis level, needed for the development of lower -power electronics via. dissipationless electronic transport in the future.
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