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Title: Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep37910· OSTI ID:1379594
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  2. Inst. of Atomic and Molecular Sciences, Taipei (Taiwan)
  3. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  5. Inst. of Atomic and Molecular Sciences, Taipei (Taiwan); National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
  6. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.; National Taiwan Univ., Taipei (Taiwan). Dept. of Physics

Charge density wave (CDW) formation, a key physics issue for materials, arises from interactions among electrons and phonons that can also lead to superconductivity and other competing or entangled phases. The prototypical system TiSe 2, with a particularly simple (2 × 2 × 2) transition and no Kohn anomalies caused by electron-phonon coupling, is a fascinating but unsolved case after decades of research. Our angle-resolved photoemission measurements of the band structure as a function of temperature, aided by first-principles calculations, reveal a hitherto undetected but crucial feature: a (2 × 2) electronic order in each layer sets in at ~232 K before the widely recognized three-dimensional structural order at ~205 K. The dimensional crossover, likely a generic feature of such layered materials, involves renormalization of different band gaps in two stages.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46383
OSTI ID:
1379594
Journal Information:
Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (8)

Non-linear enhancement of thermoelectric performance of a TiSe 2 monolayer due to tensile strain, from first-principles calculations journal January 2019
Critical Role of the Exchange Interaction for the Electronic Structure and Charge-Density-Wave Formation in TiSe 2 journal October 2017
Charge Transfer Effects in Naturally Occurring van der Waals Heterostructures ( PbSe ) 1.16 ( TiSe 2 ) m ( m = 1 , 2) journal March 2018
Local Real-Space View of the Achiral 1 T TiSe 2 2 × 2 × 2 Charge Density Wave journal March 2018
Orbital- and k z -Selective Hybridization of Se 4 p and Ti 3 d States in the Charge Density Wave Phase of TiSe 2 journal February 2019
Effect of synthesis conditions on the electrical resistivity of TiSe 2 journal August 2019
Excitonic and lattice contributions to the charge density wave in 1 T TiS e 2 revealed by a phonon bottleneck journal September 2019
Angle-resolved photoemission spectroscopy for the study of two-dimensional materials journal March 2017

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