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|Title:||Observation of effective pseudospin scattering in ZrSiS||Authors:||Md. Mofazzel Hosen
Edmonds, Mark T.
Fuhrer, Michael S.
Lodge, Michael S.
Dirac Line Node Semimetal
Low-temperature Scanning Tunneling Microscopy
|Issue Date:||2017||Source:||Lodge, M. S., Chang, G., Huang, C.-Y., Singh, B., Hellerstedt, J., Edmonds, M. T., . . . Ishigami, M. (2017). Observation of effective pseudospin scattering in ZrSiS. Nano Letters, 17(12), 7213-7217. doi:10.1021/acs.nanolett.7b02307||Series/Report no.:||Nano Letters||Abstract:||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 semimetals, the conductance and valence bands connect along a closed path in momentum space, leading 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 at single defect centers on the surface of the line nodal semimetal zirconium silicon sulfide (ZrSiS). Our QPI measurements show pseudospin conservation at energies close to the line node. In addition, we determine the Fermi velocity to be ℏvF = 2.65 ± 0.10 eV Å in the Γ–M direction ∼300 meV above the Fermi energy EF and the line node to be ∼140 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.||URI:||https://hdl.handle.net/10356/86807
|ISSN:||1530-6984||DOI:||http://dx.doi.org/10.1021/acs.nanolett.7b02307||Rights:||© 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.7b02307||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
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