Observation of anisotropic Dirac cones in the topological material Ti2Te2P

Dhakal, Gyanendra; Kabir, Firoza; Nandy, Ashis K.; Aperis, Alex; Sakhya, Anup Pradhan; Pradhan, Subhadip; Dimitri, Klauss; Sims, Christopher; Regmi, Sabin; Hosen, M. Mofazzel; Liu, Yangyang; Persaud, Luis; Kaczorowski, Dariusz; Oppeneer, Peter M.; Neupane, Madhab

doi:10.1103/physrevb.106.125124

Title: Observation of anisotropic Dirac cones in the topological material Ti 2 Te 2 P

Journal Article · Thu Sep 15 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.125124· OSTI ID:1982787

Dhakal, Gyanendra ^[1]; Kabir, Firoza ^[1]; Nandy, Ashis K. ^[2]; Aperis, Alex ^[3]; Sakhya, Anup Pradhan ^[1]; Pradhan, Subhadip ^[4]; Dimitri, Klauss ^[1]; Sims, Christopher ^[1]; Regmi, Sabin ^[1]; Hosen, M. Mofazzel ^[1]; Liu, Yangyang ^[1]; Persaud, Luis ^[1];

^[5];

^[3];

^[1]

Univ. of Central Florida, Orlando, FL (United States)
Uppsala Univ. (Sweden); Homi Bhabha National Institute, Jatni (India)
Uppsala Univ. (Sweden)
Homi Bhabha National Institute, Jatni (India)
Polish Academy of Sciences (PAS), Warsaw (Poland)

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 ${Ti}_{2} {Te}_{2} P$ on the (001) plane of the Brillouin zone. We observe quasielliptical Fermi pockets at the $\bar{M}$ 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE; US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Knut and Alice Wallenberg Foundation; Swedish National Infrastructure for Computing (SNIC); Science and Engineering Research Board (SERB)

Grant/Contract Number:: AC02-05CH11231; FA9550-17-1-0415; FA9550-20-1-0322; DMR-1847962; 2015.0060; 2018-05973; SRG/2019/000867

OSTI ID:: 1982787

Journal Information:: Physical Review. B, Vol. 106, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Observation of anisotropic Dirac cones in the topological material Ti 2 Te 2 P

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