Observation of orbital order in the van der Waals material 1T-TiSe2

Yingying Peng, Xuefei Guo, Qian Xiao, Qizhi Li, Jörg Strempfer, Yongseong Choi, Dong Yan, Huixia Luo, Yuqing Huang, Shuang Jia, Oleg Janson, Peter Abbamonte, Jeroen Van Den Brink, Jasper Van Wezel

Research output: Contribution to journalArticlepeer-review

Abstract

Besides magnetic and charge order, regular arrangements of orbital occupation constitute a fundamental order parameter of condensed matter physics. Even though orbital order is difficult to identify directly in experiments, its presence was firmly established in a number of strongly correlated, three-dimensional Mott insulators. Here, reporting resonant x-ray-scattering experiments on the layered van der Waals compound 1T-TiSe2, we establish that the known charge density wave in this weakly correlated, quasi-two-dimensional material corresponds to an orbital ordered phase. Our experimental scattering results are consistent with first-principles calculations that bring to the fore a generic mechanism of close interplay between charge redistribution, lattice displacements, and orbital order. It demonstrates the essential role that orbital degrees of freedom play in TiSe2, and their importance throughout the family of correlated van der Waals materials.

Original languageEnglish (US)
Article number033053
JournalPhysical Review Research
Volume4
Issue number3
DOIs
StatePublished - Jul 2022
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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