THz spectroscopy of the Weyl semimetal candidate Co2TiGe

ORAL

Abstract

Weyl semimetals are a class of topological materials that been the subject of intense research in the past few years. While there have been definitive examples of inversion symmetry breaking Weyl semimetals, good examples of time-reversal symmetry breaking Weyl semimetals remain elusive. In addition to being of great interest to the spintronics community due to its half-metallicity, the Heusler alloy Co2TiGe has attracted interest recently due to theoretical predictions suggesting it hosts time-reversal symmetry breaking Weyl semimetal states. Recently, MBE-grown thin films of Co2TiGe have become available, allowing for time-domain THz spectroscopy (TDTS) measurements. We present results of the low frequency optical conductivity ofCo2TiGe and discuss our results in the context of prevailing theories.

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Presenters

  • Rishi Bhandia

    Department of Physics and Astronomy, Johns Hopkins University

Authors

  • Rishi Bhandia

    Department of Physics and Astronomy, Johns Hopkins University

  • Bing Cheng

    Department of Physics, Institute for Quantum Matter, Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University

  • Tobias L Brown-Heft

    Materials Department, University of California, Santa Barbara

  • Sean Harrington

    University of California, Santa Barbara, Materials Department, University of California, Santa Barbara

  • Shouvik Chatterjee

    Electrical & Computer Engineering, University of California, Santa Barbara, UCSB, Materials Department, University of California, Santa Barbara

  • Chris Palmstrom

    University of California, Santa Barbara, University of California - Santa Barbara, University of California Santa Barbara, Electrical & Computer Engineering, University of California, Santa Barbara, ECE and Materials, University of California, Santa Barbara, Dept. of ECE, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials Engineering, University of California, Santa Barbara, University of California Santa Barbara, Materials Engineering, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara

  • Peter Armitage

    Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, United States, Department of Physics and Astronomy, Johns Hopkins University