Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB$_2$
| Title: | Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB$_2$ |
|---|---|
| Authors: | Liu, Zhonghao, Lou, Rui, Guo, Pengjie, Wang, Qi, Sun, Shanshan, Li, Chenghe, Thirupathaiah, Setti, Fedorov, Alexander, Shen, Dawei, Liu, Kai, Lei, Hechang, Wang, Shancai |
| Source: | Phys. Rev. X 8, 031044 (2018) |
| Publication Year: | 2017 |
| Collection: | Condensed Matter |
| Subject Terms: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: | The topological nodal-line semimetal state, serving as a fertile ground for various topological quantum phases, where a topological insulator, Dirac semimetal, or Weyl semimetal can be realized when the certain protecting symmetry is broken, has only been experimentally studied in very few materials. In contrast to discrete nodes, nodal lines with rich topological configurations can lead to more unusual transport phenomena. Utilizing angle-resolved photoemission spectroscopy and first-principles calculations, here, we provide compelling evidence of nodal-line fermions in centrosymmetric semimetal TiB$_2$ with a negligible spin-orbit coupling effect. With the band crossings just below the Fermi energy, two groups of Dirac nodal rings are clearly observed without any interference from other bands, one surrounding the Brillouin zone (BZ) corner in the horizontal mirror plane $\sigma_h$ and the other surrounding the BZ center in the vertical mirror plane $\sigma_v$. The linear dispersions forming Dirac nodal rings are as wide as 2 eV. We further observe that the two groups of nodal rings link together along the $\Gamma$-$K$ direction, composing a nodal-link configuration. The simple electronic structure with Dirac nodal links mainly constituting the Fermi surfaces suggests TiB$_2$ as a remarkable platform for studying and applying the novel physical properties related to nodal-line fermions. Comment: 17 pages, 4 figures |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevX.8.031044 |
| Access URL: | http://arxiv.org/abs/1712.03048 |
| Accession Number: | edsarx.1712.03048 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB$_2$ – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Liu%2C+Zhonghao%22">Liu, Zhonghao</searchLink><br /><searchLink fieldCode="AR" term="%22Lou%2C+Rui%22">Lou, Rui</searchLink><br /><searchLink fieldCode="AR" term="%22Guo%2C+Pengjie%22">Guo, Pengjie</searchLink><br /><searchLink fieldCode="AR" term="%22Wang%2C+Qi%22">Wang, Qi</searchLink><br /><searchLink fieldCode="AR" term="%22Sun%2C+Shanshan%22">Sun, Shanshan</searchLink><br /><searchLink fieldCode="AR" term="%22Li%2C+Chenghe%22">Li, Chenghe</searchLink><br /><searchLink fieldCode="AR" term="%22Thirupathaiah%2C+Setti%22">Thirupathaiah, Setti</searchLink><br /><searchLink fieldCode="AR" term="%22Fedorov%2C+Alexander%22">Fedorov, Alexander</searchLink><br /><searchLink fieldCode="AR" term="%22Shen%2C+Dawei%22">Shen, Dawei</searchLink><br /><searchLink fieldCode="AR" term="%22Liu%2C+Kai%22">Liu, Kai</searchLink><br /><searchLink fieldCode="AR" term="%22Lei%2C+Hechang%22">Lei, Hechang</searchLink><br /><searchLink fieldCode="AR" term="%22Wang%2C+Shancai%22">Wang, Shancai</searchLink> – Name: TitleSource Label: Source Group: Src Data: Phys. Rev. X 8, 031044 (2018) – Name: DatePubCY Label: Publication Year Group: Date Data: 2017 – Name: Subset Label: Collection Group: HoldingsInfo Data: Condensed Matter – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Condensed+Matter+-+Materials+Science%22">Condensed Matter - Materials Science</searchLink><br /><searchLink fieldCode="DE" term="%22Condensed+Matter+-+Mesoscale+and+Nanoscale+Physics%22">Condensed Matter - Mesoscale and Nanoscale Physics</searchLink> – Name: Abstract Label: Description Group: Ab Data: The topological nodal-line semimetal state, serving as a fertile ground for various topological quantum phases, where a topological insulator, Dirac semimetal, or Weyl semimetal can be realized when the certain protecting symmetry is broken, has only been experimentally studied in very few materials. In contrast to discrete nodes, nodal lines with rich topological configurations can lead to more unusual transport phenomena. Utilizing angle-resolved photoemission spectroscopy and first-principles calculations, here, we provide compelling evidence of nodal-line fermions in centrosymmetric semimetal TiB$_2$ with a negligible spin-orbit coupling effect. With the band crossings just below the Fermi energy, two groups of Dirac nodal rings are clearly observed without any interference from other bands, one surrounding the Brillouin zone (BZ) corner in the horizontal mirror plane $\sigma_h$ and the other surrounding the BZ center in the vertical mirror plane $\sigma_v$. The linear dispersions forming Dirac nodal rings are as wide as 2 eV. We further observe that the two groups of nodal rings link together along the $\Gamma$-$K$ direction, composing a nodal-link configuration. The simple electronic structure with Dirac nodal links mainly constituting the Fermi surfaces suggests TiB$_2$ as a remarkable platform for studying and applying the novel physical properties related to nodal-line fermions.<br />Comment: 17 pages, 4 figures – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1103/PhysRevX.8.031044 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/1712.03048" linkWindow="_blank">http://arxiv.org/abs/1712.03048</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.1712.03048 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1103/PhysRevX.8.031044 Subjects: – SubjectFull: Condensed Matter - Materials Science Type: general – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics Type: general Titles: – TitleFull: Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB$_2$ Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Liu, Zhonghao – PersonEntity: Name: NameFull: Lou, Rui – PersonEntity: Name: NameFull: Guo, Pengjie – PersonEntity: Name: NameFull: Wang, Qi – PersonEntity: Name: NameFull: Sun, Shanshan – PersonEntity: Name: NameFull: Li, Chenghe – PersonEntity: Name: NameFull: Thirupathaiah, Setti – PersonEntity: Name: NameFull: Fedorov, Alexander – PersonEntity: Name: NameFull: Shen, Dawei – PersonEntity: Name: NameFull: Liu, Kai – PersonEntity: Name: NameFull: Lei, Hechang – PersonEntity: Name: NameFull: Wang, Shancai IsPartOfRelationships: – BibEntity: Dates: – D: 08 M: 12 Type: published Y: 2017 |
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