%0 Journal Article %1 PhysRevResearch.4.033053 %A Peng, Yingying %A Guo, Xuefei %A Xiao, Qian %A Li, Qizhi %A Strempfer, Jörg %A Choi, Yongseong %A Yan, Dong %A Luo, Huixia %A Huang, Yuqing %A Jia, Shuang %A Janson, Oleg %A Abbamonte, Peter %A van den Brink, Jeroen %A van Wezel, Jasper %D 2022 %I American Physical Society %J Phys. Rev. Res. %K a b %N 3 %P 033053 %R 10.1103/PhysRevResearch.4.033053 %T Observation of orbital order in the van der Waals material 1T-TiSe$_2$ %U https://link.aps.org/doi/10.1103/PhysRevResearch.4.033053 %V 4 %X 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.

@article{PhysRevResearch.4.033053, 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.}, added-at = {2023-05-23T13:03:37.000+0200}, author = {Peng, Yingying and Guo, Xuefei and Xiao, Qian and Li, Qizhi and Strempfer, Jörg and Choi, Yongseong and Yan, Dong and Luo, Huixia and Huang, Yuqing and Jia, Shuang and Janson, Oleg and Abbamonte, Peter and van den Brink, Jeroen and van Wezel, Jasper}, biburl = {https://www.bibsonomy.org/bibtex/24194c34f29738f380cd7a0bc71709fa2/ctqmat}, day = 18, description = {Observation of orbital order in the van der Waals material 1T-TiSe2}, doi = {10.1103/PhysRevResearch.4.033053}, interhash = {9fd5b3bf7172042e3cc6424ba45c0f14}, intrahash = {4194c34f29738f380cd7a0bc71709fa2}, journal = {Phys. Rev. Res.}, keywords = {a b}, month = {07}, number = 3, numpages = {8}, pages = 033053, publisher = {American Physical Society}, timestamp = {2023-10-18T14:05:03.000+0200}, title = {Observation of orbital order in the van der Waals material 1T-TiSe$_{\mathbf{2}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.4.033053}, volume = 4, year = 2022 }