Observation of Effective Pseudospin Scattering in ZrSiS

Michael S. Lodge, Guoqing Chang, Cheng Yi Huang, Bahadur Singh, Jack Hellerstedt, Mark T. Edmonds, Dariusz Kaczorowski, Md Mofazzel Hosen, Madhab Neupane, Hsin Lin, Michael S. Fuhrer, Bent Weber, Masahiro Ishigami

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

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 vF = 2.65 ± 0.10 eV Å in the Δ-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.

Original languageEnglish
Pages (from-to)7213-7217
Number of pages5
JournalNano Letters
Volume17
Issue number12
DOIs
Publication statusPublished - 13 Dec 2017

Keywords

  • Dirac line node semimetal
  • FT-STS
  • low-temperature scanning tunneling microscopy
  • quasiparticle interference spectroscopy
  • topological phases of matter

Cite this

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. https://doi.org/10.1021/acs.nanolett.7b02307
Lodge, Michael S. ; Chang, Guoqing ; Huang, Cheng Yi ; Singh, Bahadur ; Hellerstedt, Jack ; Edmonds, Mark T. ; Kaczorowski, Dariusz ; Hosen, Md Mofazzel ; Neupane, Madhab ; Lin, Hsin ; Fuhrer, Michael S. ; Weber, Bent ; Ishigami, Masahiro. / Observation of Effective Pseudospin Scattering in ZrSiS. In: Nano Letters. 2017 ; Vol. 17, No. 12. pp. 7213-7217.
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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 vF = 2.65 ± 0.10 eV {\AA} in the Δ-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.",
keywords = "Dirac line node semimetal, FT-STS, low-temperature scanning tunneling microscopy, quasiparticle interference spectroscopy, topological phases of matter",
author = "Lodge, {Michael S.} and Guoqing Chang and Huang, {Cheng Yi} and Bahadur Singh and Jack Hellerstedt and Edmonds, {Mark T.} and Dariusz Kaczorowski and Hosen, {Md Mofazzel} and Madhab Neupane and Hsin Lin and Fuhrer, {Michael S.} and Bent Weber and Masahiro Ishigami",
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Lodge, MS, Chang, G, Huang, CY, Singh, B, Hellerstedt, J, Edmonds, MT, Kaczorowski, D, Hosen, MM, Neupane, M, Lin, H, Fuhrer, MS, Weber, B & Ishigami, M 2017, 'Observation of Effective Pseudospin Scattering in ZrSiS', Nano Letters, vol. 17, no. 12, pp. 7213-7217. https://doi.org/10.1021/acs.nanolett.7b02307

Observation of Effective Pseudospin Scattering in ZrSiS. / Lodge, Michael S.; Chang, Guoqing; Huang, Cheng Yi; Singh, Bahadur; Hellerstedt, Jack; Edmonds, Mark T.; Kaczorowski, Dariusz; Hosen, Md Mofazzel; Neupane, Madhab; Lin, Hsin; Fuhrer, Michael S.; Weber, Bent; Ishigami, Masahiro.

In: Nano Letters, Vol. 17, No. 12, 13.12.2017, p. 7213-7217.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Observation of Effective Pseudospin Scattering in ZrSiS

AU - Lodge, Michael S.

AU - Chang, Guoqing

AU - Huang, Cheng Yi

AU - Singh, Bahadur

AU - Hellerstedt, Jack

AU - Edmonds, Mark T.

AU - Kaczorowski, Dariusz

AU - Hosen, Md Mofazzel

AU - Neupane, Madhab

AU - Lin, Hsin

AU - Fuhrer, Michael S.

AU - Weber, Bent

AU - Ishigami, Masahiro

PY - 2017/12/13

Y1 - 2017/12/13

N2 - 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 vF = 2.65 ± 0.10 eV Å in the Δ-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.

AB - 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 vF = 2.65 ± 0.10 eV Å in the Δ-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.

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KW - FT-STS

KW - low-temperature scanning tunneling microscopy

KW - quasiparticle interference spectroscopy

KW - topological phases of matter

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U2 - 10.1021/acs.nanolett.7b02307

DO - 10.1021/acs.nanolett.7b02307

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JF - Nano Letters

SN - 1530-6984

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