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

P. Chen (), Woei Wu Pai, Y.-H. Chan, A. Takayama, C.-Z. Xu, A. Karn, S. Hasegawa, M. Y. Chou, S.-K. Mo, A.-V. Fedorov and T.-C. Chiang ()
Additional contact information
P. Chen: University of Illinois at Urbana-Champaign
Woei Wu Pai: National Taiwan University
Y.-H. Chan: Institute of Atomic and Molecular Sciences, Academia Sinica
A. Takayama: University of Tokyo
C.-Z. Xu: University of Illinois at Urbana-Champaign
A. Karn: National Taiwan University
S. Hasegawa: University of Tokyo
M. Y. Chou: National Taiwan University
S.-K. Mo: Advanced Light Source, Lawrence Berkeley National Laboratory
A.-V. Fedorov: Advanced Light Source, Lawrence Berkeley National Laboratory
T.-C. Chiang: University of Illinois at Urbana-Champaign

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00641-1

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