An Investigation on the Stability of a Three-Dimensional Dirac Cone in a Layered Air-Stable Ferromagnet

ORAL

Abstract

Platinum Ditelluride (PtTe2) is known to be a Dirac semimetal with type-II Dirac excitations as well as topologically protected surface states. When Chromium (Cr) is substituted into the Platinum (Pt) sites, this material has been shown to become an air-stable ferromagnet with Curie temperatures up to 220 K[1]. These synthesized materials pose an interesting set of questions including the evolution of the topologically protected states as the Cr substitution increases. In this work, we present high resolution ARPES data and first-principle Density Functional Theory (DFT) calculations on these ferromagnetic compounds, showing a resilient type-II Dirac cone that normally would split into separate Weyl nodes upon the addition of the magnetic element, Cr. Additionally, we show a more fragile evolution of the topologically protected surface states in this family of materials.

* The primary funding for this work was provided by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-SC0018154. I.P, D.B and M.N. were supported by the Cal State Long Beach and Ohio State University NSF PREM under Grant No.2122199 for traveling. JEG, AJW, and WLBH acknowledge the Center for Emergent Materials, an NSF MRSEC, under award number DMR-2011876 for crystal growth. JQ and WW acknowledge the Air Force Office of Scientific Research for funding from FA9550-21-1-02684 for theoretical calculations performed at the Ohio Supercomputer Center under project number PAS0072. The U.S. DOE-BES supports the Advanced Light Source under Contract No. DE-AC02-05CH11231 as well as the photoemission work by L. M. and A.L. under contract number DE-AC02-05CH11231 within the vdW heterostructure Program (KCWF16).

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Publication: [1]Huey, W. L. B., Ochs, A. M., Williams, A. J., Zhang, Y., Kraguljac, S., Deng, Z., … Goldberger, J. E. (2022). CrxPt1–xTe2 (x ≤ 0.45): A Family of Air-Stable and Exfoliatable van der Waals Ferromagnets. ACS Nano, 16(3), 3852–3860. doi:10.1021/acsnano.1c08681

Presenters

  • Derek C Bergner

    California State University, Long Beach

Authors

  • Derek C Bergner

    California State University, Long Beach

  • Ivan Pelayo

    California State University, Long Beach

  • Mahfuzun Nabi

    California State University, Long Beach

  • Archibald J Williams

    The Ohio State University

  • Jiayuwen Qi

    The Ohio State University

  • Warren L Huey

    The Ohio State University

  • Ziling Deng

    The Ohio State University

  • Luca Moreschini

    University of California, Berkeley

  • Jonanthan D Denlinger

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab

  • Alessandra Lanzara

    University of California, Berkeley

  • Wolfgang E Windl

    Ohio State Univ - Columbus

  • Joshua E Goldberger

    The Ohio State University, Ohio State University

  • Claudia Ojeda-Aristizabal

    California State University, Long Beach