Band topology of bismuth quantum films

Tay Rong Chang, Qiangsheng Lu, Xiaoxiong Wang, Hsin Lin, T. Miller, Tai Chang Chiang, Guang Bian

Research output: Contribution to journalArticle

Abstract

Bismuth has been the key element in the discovery and development of topological insulator materials. Previous theoretical studies indicated that Bi is topologically trivial and it can transform into the topological phase by alloying with Sb. However, recent high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements strongly suggested a topological band structure in pure Bi, conflicting with the theoretical results. To address this issue, we studied the band structure of Bi and Sb films by ARPES and first-principles calculations. The quantum confinement effectively enlarges the energy gap in the band structure of Bi films and enables a direct visualization of the ℤ2 topological invariant of Bi. We find that Bi quantum films in topologically trivial and nontrivial phases respond differently to surface perturbations. This way, we establish experimental criteria for detecting the band topology of Bi by spectroscopic methods.

Original languageEnglish
Article number510
JournalCrystals
Volume9
Issue number10
DOIs
Publication statusPublished - 2019 Oct

Fingerprint

Bismuth
Band structure
bismuth
topology
Topology
Photoelectron spectroscopy
Quantum confinement
photoelectric emission
Alloying
Energy gap
Visualization
spectroscopy
alloying
insulators
perturbation
high resolution

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

Cite this

Chang, T. R., Lu, Q., Wang, X., Lin, H., Miller, T., Chiang, T. C., & Bian, G. (2019). Band topology of bismuth quantum films. Crystals, 9(10), [510]. https://doi.org/10.3390/cryst9100510
Chang, Tay Rong ; Lu, Qiangsheng ; Wang, Xiaoxiong ; Lin, Hsin ; Miller, T. ; Chiang, Tai Chang ; Bian, Guang. / Band topology of bismuth quantum films. In: Crystals. 2019 ; Vol. 9, No. 10.
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Chang, TR, Lu, Q, Wang, X, Lin, H, Miller, T, Chiang, TC & Bian, G 2019, 'Band topology of bismuth quantum films', Crystals, vol. 9, no. 10, 510. https://doi.org/10.3390/cryst9100510

Band topology of bismuth quantum films. / Chang, Tay Rong; Lu, Qiangsheng; Wang, Xiaoxiong; Lin, Hsin; Miller, T.; Chiang, Tai Chang; Bian, Guang.

In: Crystals, Vol. 9, No. 10, 510, 10.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Band topology of bismuth quantum films

AU - Chang, Tay Rong

AU - Lu, Qiangsheng

AU - Wang, Xiaoxiong

AU - Lin, Hsin

AU - Miller, T.

AU - Chiang, Tai Chang

AU - Bian, Guang

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Chang TR, Lu Q, Wang X, Lin H, Miller T, Chiang TC et al. Band topology of bismuth quantum films. Crystals. 2019 Oct;9(10). 510. https://doi.org/10.3390/cryst9100510