Emergence of charge density waves and a pseudogap in single-layer TiTe2

P. Chen, Woei Wu Pai, Y. H. Chan, Akari Takayama, C. Z. Xu, A. Karn, S. Hasegawa, M. Y. Chou, S. K. Mo, A. V. Fedorov, T. C. Chiang

Research output: Contribution to journalArticle

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Abstract

Two-dimensional materials constitute a promising platform for developing nanoscale devices and systems. Their physical properties can be very different from those of the corresponding three-dimensional materials because of extreme quantum confinement and dimensional reduction. Here we report a study of TiTe2 from the single-layer to the bulk limit. Using angle-resolved photoemission spectroscopy and scanning tunneling microscopy and spectroscopy, we observed the emergence of a (2 × 2) charge density wave order in single-layer TiTe2 with a transition temperature of 92 ± 3 K. Also observed was a pseudogap of about 28 meV at the Fermi level at 4.2 K. Surprisingly, no charge density wave transitions were observed in two-layer and multi-layer TiTe2, despite the quasi-two-dimensional nature of the material in the bulk. The unique charge density wave phenomenon in the single layer raises intriguing questions that challenge the prevailing thinking about the mechanisms of charge density wave formation.

Original languageEnglish
Article number516
JournalNature Communications
Volume8
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1
Externally publishedYes

Fingerprint

Scanning Tunnelling Microscopy
Charge density waves
Photoelectron Spectroscopy
Transition Temperature
Spectrum Analysis
Equipment and Supplies
Quantum confinement
Scanning tunneling microscopy
Photoelectron spectroscopy
Fermi level
Physical properties
spectroscopy
Spectroscopy
scanning tunneling microscopy
photoelectric emission
platforms
physical properties
transition temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Emergence of charge density waves and a pseudogap in single-layer TiTe2 . / Chen, P.; Pai, Woei Wu; Chan, Y. H.; Takayama, Akari; Xu, C. Z.; Karn, A.; Hasegawa, S.; Chou, M. Y.; Mo, S. K.; Fedorov, A. V.; Chiang, T. C.

In: Nature Communications, Vol. 8, No. 1, 516, 01.12.2017.

Research output: Contribution to journalArticle

Chen, P, Pai, WW, Chan, YH, Takayama, A, Xu, CZ, Karn, A, Hasegawa, S, Chou, MY, Mo, SK, Fedorov, AV & Chiang, TC 2017, 'Emergence of charge density waves and a pseudogap in single-layer TiTe2 ', Nature Communications, vol. 8, no. 1, 516. https://doi.org/10.1038/s41467-017-00641-1
Chen, P. ; Pai, Woei Wu ; Chan, Y. H. ; Takayama, Akari ; Xu, C. Z. ; Karn, A. ; Hasegawa, S. ; Chou, M. Y. ; Mo, S. K. ; Fedorov, A. V. ; Chiang, T. C. / Emergence of charge density waves and a pseudogap in single-layer TiTe2 In: Nature Communications. 2017 ; Vol. 8, No. 1.
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