Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave
Abstract Stacking of strongly-correlated 2D materials is opening the possibility to demonstrate novel electronic or magnetic ordering phenomena. In this regard the intrinsic polytypism of tantalum dichalcogenides has emerged as a platform to generate clean and controllable material interfaces. Here,...
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Nature Portfolio
2025-02-01
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| Series: | Communications Materials |
| Online Access: | https://doi.org/10.1038/s43246-025-00743-0 |
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| author | Matthew D. Watson Andrea Tonelli Mugerabe Zerabza Sam Hayward Rebecca Wilkinson Ettore Carpene Cephise Cacho Valentina De Renzi Simon Crampin Enrico Da Como |
| author_facet | Matthew D. Watson Andrea Tonelli Mugerabe Zerabza Sam Hayward Rebecca Wilkinson Ettore Carpene Cephise Cacho Valentina De Renzi Simon Crampin Enrico Da Como |
| author_sort | Matthew D. Watson |
| collection | DOAJ |
| description | Abstract Stacking of strongly-correlated 2D materials is opening the possibility to demonstrate novel electronic or magnetic ordering phenomena. In this regard the intrinsic polytypism of tantalum dichalcogenides has emerged as a platform to generate clean and controllable material interfaces. Here, we report on the Fermi surface of 4Hb-TaSe2, a polytype which consists of alternately stacked layers with octahedral (T) and trigonal prismatic (H) coordination of tantalum in the Se-Ta-Se layers. The material is known to host a charge density wave (CDW) phase with star clusters in the T-layers, intercalated by metallic H-layers, but its momentum resolved electronic structure remains undetermined. Using selective area angle resolved photoemission spectroscopy on the T termination combined with ab initio calculations, we unveil a finely structured Fermi surface arising from band folding in the reconstructed Brillouin zone caused by the CDW star clusters. The star-shaped Fermi surface is rotated away from the high-symmetry directions of the normal phase, and exhibits pseudochirality. Theoretical analysis supports the metallic nature of the system and interlayer interactions leading to hybridization. The work provides a detailed overview on the impact of band hybridization with the CDW on the Fermi surface of a material for new phases of quantum matter. |
| format | Article |
| id | doaj-art-8dbca940218e4b6cb720a7711d1b3de9 |
| institution | Kabale University |
| issn | 2662-4443 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Materials |
| spelling | doaj-art-8dbca940218e4b6cb720a7711d1b3de92025-02-09T12:47:12ZengNature PortfolioCommunications Materials2662-44432025-02-01611710.1038/s43246-025-00743-0Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density waveMatthew D. Watson0Andrea Tonelli1Mugerabe Zerabza2Sam Hayward3Rebecca Wilkinson4Ettore Carpene5Cephise Cacho6Valentina De Renzi7Simon Crampin8Enrico Da Como9Diamond Light Source Ltd, Harwell Science and Innovation CampusDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownIFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32 MilanDiamond Light Source Ltd, Harwell Science and Innovation CampusDipartimento di Scienze Fisiche, Informatiche e Matematiche (FIM), Università degli Studi di Modena e Reggio Emilia, Via Campi 213aDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownDepartment of Physics and Centre for Nanoscience and Nanotechnology (CNAN), University of Bath, Claverton DownAbstract Stacking of strongly-correlated 2D materials is opening the possibility to demonstrate novel electronic or magnetic ordering phenomena. In this regard the intrinsic polytypism of tantalum dichalcogenides has emerged as a platform to generate clean and controllable material interfaces. Here, we report on the Fermi surface of 4Hb-TaSe2, a polytype which consists of alternately stacked layers with octahedral (T) and trigonal prismatic (H) coordination of tantalum in the Se-Ta-Se layers. The material is known to host a charge density wave (CDW) phase with star clusters in the T-layers, intercalated by metallic H-layers, but its momentum resolved electronic structure remains undetermined. Using selective area angle resolved photoemission spectroscopy on the T termination combined with ab initio calculations, we unveil a finely structured Fermi surface arising from band folding in the reconstructed Brillouin zone caused by the CDW star clusters. The star-shaped Fermi surface is rotated away from the high-symmetry directions of the normal phase, and exhibits pseudochirality. Theoretical analysis supports the metallic nature of the system and interlayer interactions leading to hybridization. The work provides a detailed overview on the impact of band hybridization with the CDW on the Fermi surface of a material for new phases of quantum matter.https://doi.org/10.1038/s43246-025-00743-0 |
| spellingShingle | Matthew D. Watson Andrea Tonelli Mugerabe Zerabza Sam Hayward Rebecca Wilkinson Ettore Carpene Cephise Cacho Valentina De Renzi Simon Crampin Enrico Da Como Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave Communications Materials |
| title | Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave |
| title_full | Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave |
| title_fullStr | Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave |
| title_full_unstemmed | Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave |
| title_short | Folded pseudochiral Fermi surface in 4Hb-TaSe2 from band hybridization with a charge density wave |
| title_sort | folded pseudochiral fermi surface in 4hb tase2 from band hybridization with a charge density wave |
| url | https://doi.org/10.1038/s43246-025-00743-0 |
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