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Evidence for pseudo-Jahn-Teller distortions in the charge density wave phase of 1T-TiSe2
Journal article   Open access   Peer reviewed

Evidence for pseudo-Jahn-Teller distortions in the charge density wave phase of 1T-TiSe2

A. Wegner, J. Zhao, J. Yang, A. A. Anikin, G. Karapetrov, K. Esfarjani, D. Louca and U. Chatterjee
Physical review. B, v 101(19), p1
27 May 2020
DOI: https://doi.org/10.1103/PhysRevB.101.195145
url
https://www.osti.gov/biblio/1800033View
SubmittedOpen Access (License Unspecified),  Open

Abstract

Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Science & Technology Materials Science Physical Sciences Physics Technology
The charge density wave (CDW) instability in 1T-TiSe2 is revisited to investigate its electronic and structural origins using angle resolved photoemission spectroscopy (ARPES), neutron diffraction, and density functional theory (DFT) calculations. The evidence for Jahn-Teller (JT)-like distortions in the CDW state is provided from the local structure analysis that shows splitting of the Ti-Se bonds into short and long. The magnitude of the split is inconsistent with the commonly accepted Di Salvo model for the structural distortions in the CDW phase. From the APRES data, it is deduced that a nontrivial temperature-dependent energy shift of the Se 4p valence bands occurs, but is absent for the Ti 3d conduction bands. Collectively, these observations suggest that a JT-like mechanism is most likely central to the CDW instability in 1T-TiSe2.

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38 citations in Web of Science
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Collaboration types
Domestic collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
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