Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2
Abstract
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:
-
- 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
- Inst. of Atomic and Molecular Sciences, Taipei (Taiwan)
- 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
- Inst. of Atomic and Molecular Sciences, Taipei (Taiwan); National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
- 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:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1379594
- Grant/Contract Number:
- AC02-05CH11231; FG02-07ER46383
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; phase transitions and critical phenomena; semiconductors; surfaces, interfaces and films
Citation Formats
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., 2016.
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. https://doi.org/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. https://doi.org/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},
url = {https://www.osti.gov/biblio/1379594},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 6,
place = {United States},
year = {Tue Nov 29 00:00:00 EST 2016},
month = {Tue Nov 29 00:00:00 EST 2016}
}
Web of Science
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