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PreprintarXiv licencearXiv

Stacking-Induced Tuning of a Flat-Band Surface State in NbIrTe4

  • Jiabin Yu
  • Mohamed Oudah
  • Giang Nguyen
  • Hsianghsi Kung
  • V. King
  • Rysa Greenwood
  • Adrian F. Rumson
  • Jisun Kim
  • Matteo Michiardi
  • Giorgio Levy
  • Andrea Damascelli
  • E. R. Johnson
3 more authors
  • Meigan Aronson
  • Lukas Muechler
  • Sarah A. Burke
Open at sourcePDFDOICite

Abstract

Ternary layered transition metal dichalcogenides (TMDCs) offer high tunability and access to correlated and topological states. However, like the broader family of layered TMDCs, their properties are sensitive to stacking order and interlayer coupling. Here, we investigate the electronic structure and surface states of NbIrTe4, a candidate Weyl semimetal in bulk, and predicted to be a quantum spin Hall insulator in monolayer form. Using scanning tunnelling microscopy (STM), angle-resolved photoemission spectroscopy (ARPES), and density-functional theory (DFT), we attribute the strong resonance in tunnelling spectroscopy located approximately 8 meV below the Fermi level to a surface-derived flat band which shows sensitivity to the local stacking order at the surface. In regions where the top layer is laterally shifted, tunnelling spectroscopy instead shows a gap-like feature with intensity near the Fermi level shifted in energy. Combining DFT and quasiparticle interference (QPI) measurements, we find this dramatic change in the spectroscopy in the vicinity of the quasi-1D flat-band surface state becomes dispersive due to a change in the spatial distribution of the density of states in the top two layers. These findings establish NbIrTe4 as a platform where surface band dispersion can be effectively tuned through local structural manipulation.

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Cite

BibTeXRIS
BibTeX
@misc{yu2026stackinginduced,
  title = {{Stacking-Induced Tuning of a Flat-Band Surface State in NbIrTe4}},
  author = {Jiabin Yu and Mohamed Oudah and Giang Nguyen and Hsianghsi Kung and V. King and Rysa Greenwood and Adrian F. Rumson and Jisun Kim and Matteo Michiardi and Giorgio Levy and Andrea Damascelli and E. R. Johnson and Meigan Aronson and Lukas Muechler and Sarah A. Burke},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.27096},
  eprint = {2610.27096},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.27096},
}
RIS
TY  - UNPB
TI  - Stacking-Induced Tuning of a Flat-Band Surface State in NbIrTe4
AU  - Jiabin Yu
AU  - Mohamed Oudah
AU  - Giang Nguyen
AU  - Hsianghsi Kung
AU  - V. King
AU  - Rysa Greenwood
AU  - Adrian F. Rumson
AU  - Jisun Kim
AU  - Matteo Michiardi
AU  - Giorgio Levy
AU  - Andrea Damascelli
AU  - E. R. Johnson
AU  - Meigan Aronson
AU  - Lukas Muechler
AU  - Sarah A. Burke
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2610.27096
UR  - https://arxiv.org/abs/2610.27096
AB  - Ternary layered transition metal dichalcogenides (TMDCs) offer high tunability and access to correlated and topological states. However, like the broader family of layered TMDCs, their properties are sensitive to stacking order and interlayer coupling. Here, we investigate the electronic structure and surface states of NbIrTe_4, a candidate Weyl semimetal in bulk, and predicted to be a quantum spin Hall insulator in monolayer form. Using scanning tunnelling microscopy (STM), angle-resolved photoemission spectroscopy (ARPES), and density-functional theory (DFT), we attribute the strong resonance in tunnelling spectroscopy located approximately 8 meV below the Fermi level to a surface-derived flat band which shows sensitivity to the local stacking order at the surface. In regions where the top layer is laterally shifted, tunnelling spectroscopy instead shows a gap-like feature with intensity near the Fermi level shifted in energy. Combining DFT and quasiparticle interference (QPI) measurements, we find this dramatic change in the spectroscopy in the vicinity of the quasi-1D flat-band surface state becomes dispersive due to a change in the spatial distribution of the density of states in the top two layers. These findings establish NbIrTe_4 as a platform where surface band dispersion can be effectively tuned through local structural manipulation.
ER  -