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Observation of anisotropic Dirac cones in the topological material Ti2Te2P
Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA..
Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Natl Inst Sci Educ & Res, Sch Phys Sci, Jatni 752050, India..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-1699-2476
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2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 12, article id 125124Article in journal (Refereed) Published
Abstract [en]

Anisotropic bulk Dirac (or Weyl) cones in three-dimensional systems have recently gained intense research interest as they are examples of materials with tilted Dirac (or Weyl) cones indicating the violation of Lorentz invariance. In contrast, the studies on anisotropic surface Dirac cones in topological materials which contribute to anisotropic carrier mobility have been limited. By employing angle-resolved photoemission spectroscopy and first-principles calculations, we reveal the anisotropic surface Dirac dispersion in a tetradymite material Ti2Te2P on the (001) plane of the Brillouin zone. We observe quasielliptical Fermi pockets at the (M) over bar point of the Brillouin zone forming the anisotropic surface Dirac cones. Our calculations of the Z(2) indices confirm that the system is topologically nontrivial with multiple topological phases in the same material. In addition, the observed nodal-line-like feature formed by bulk bands makes this system topologically rich.

Place, publisher, year, edition, pages
American Physical Society, 2022. Vol. 106, no 12, article id 125124
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-498872DOI: 10.1103/PhysRevB.106.125124ISI: 000916470000002OAI: oai:DiVA.org:uu-498872DiVA, id: diva2:1746046
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060Swedish National Infrastructure for Computing (SNIC), 2018-05973Available from: 2023-03-27 Created: 2023-03-27 Last updated: 2023-03-27Bibliographically approved

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Nandy, Ashis K.Aperis, AlexOppeneer, Peter M.

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