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Title: Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe 2

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.
Authors:
 [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
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46383
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; phase transitions and critical phenomena; semiconductors; surfaces, interfaces and films
OSTI Identifier:
1379594

Chen, P., Chan, Y. -H., Fang, X. -Y., Mo, S. -K., Hussain, Z., Fedorov, A. -V., Chou, M. Y., and Chiang, T. -C.. Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2. United States: N. p., Web. doi:10.1038/srep37910.
Chen, P., Chan, Y. -H., Fang, X. -Y., Mo, S. -K., Hussain, Z., Fedorov, A. -V., Chou, M. Y., & Chiang, T. -C.. Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2. United States. doi:10.1038/srep37910.
Chen, P., Chan, Y. -H., Fang, X. -Y., Mo, S. -K., Hussain, Z., Fedorov, A. -V., Chou, M. Y., and Chiang, T. -C.. 2016. "Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2". United States. doi:10.1038/srep37910. https://www.osti.gov/servlets/purl/1379594.
@article{osti_1379594,
title = {Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2},
author = {Chen, P. and Chan, Y. -H. and Fang, X. -Y. and Mo, S. -K. and Hussain, Z. and Fedorov, A. -V. and Chou, M. Y. and Chiang, T. -C.},
abstractNote = {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.},
doi = {10.1038/srep37910},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {11}
}

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