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Title: Emergence of charge density waves and a pseudogap in single-layer TiTe 2

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 in this paper we report a study of TiTe 2 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 TiTe 2 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 TiTe 2 , 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.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [1];  [5];  [4];  [6]; ORCiD logo [7];  [7];  [8]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics; Univ. of Illinois, Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sciences; National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
  3. Academia Sinica, Taipei (Taiwan). Inst. of Atomic and Molecular Sciences
  4. Univ. of Tokyo (Japan). Dept. of Physics
  5. National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sciences
  6. Taipei (Taiwan). Dept. of Physics; Academia Sinica, Taipei (Taiwan). Inst. of Atomic and Molecular Sciences; Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics; Univ. of Illinois, Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.; Taipei (Taiwan). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Ministry of Science and Technology of Taiwan
OSTI Identifier:
1408490
Grant/Contract Number:  
AC02-05CH11231; FG02-07ER46383; EFMA-1542747; 103-2923-M-002-003-MY3; JP16 H02108; JP25110010; JP15K17464
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electronic properties and materials; Phase transitions and critical phenomena; Surfaces, interfaces and thin films

Citation Formats

Chen, P., Pai, Woei Wu, Chan, Y. -H., Takayama, A., Xu, C. -Z., Karn, A., Hasegawa, S., Chou, M. Y., Mo, S. -K., Fedorov, A. -V., and Chiang, T. -C. Emergence of charge density waves and a pseudogap in single-layer TiTe2. United States: N. p., 2017. Web. doi:10.1038/s41467-017-00641-1.
Chen, P., Pai, Woei Wu, Chan, Y. -H., Takayama, A., 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. United States. doi:10.1038/s41467-017-00641-1.
Chen, P., Pai, Woei Wu, Chan, Y. -H., Takayama, A., Xu, C. -Z., Karn, A., Hasegawa, S., Chou, M. Y., Mo, S. -K., Fedorov, A. -V., and Chiang, T. -C. Mon . "Emergence of charge density waves and a pseudogap in single-layer TiTe2". United States. doi:10.1038/s41467-017-00641-1. https://www.osti.gov/servlets/purl/1408490.
@article{osti_1408490,
title = {Emergence of charge density waves and a pseudogap in single-layer TiTe2},
author = {Chen, P. and Pai, Woei Wu and Chan, Y. -H. and Takayama, A. and Xu, C. -Z. and Karn, A. and Hasegawa, S. and Chou, M. Y. and Mo, S. -K. and Fedorov, A. -V. and Chiang, T. -C.},
abstractNote = {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 in this paper 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 TiTe 2 , 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.},
doi = {10.1038/s41467-017-00641-1},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {9}
}

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    Works referencing / citing this record:

    Excitonic effects in two-dimensional TiSe 2 from hybrid density functional theory
    journal, December 2018


    Pressure-induced evolution of structural and electronic properties in TiT e 2
    journal, March 2019