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Electron-phonon Interactions in the Weyl semimetal NbIrTe<sub>4 </sub>Using Raman Spectroscopy

ORAL

Abstract

Strong anisotropic behavior of Raman modes has been detected in polarized Raman spectroscopy of a ternary compound NbIrTe4 nanoflake. 19 Raman modes of A1 and A2 symmetries were detected and were consistent with DFT calculations. By rotating the sample the Raman spectroscopy probes different directions of the crystal structure. These measurements were implemented so that the polarization direction of the incident and scattered beams are parallel and perpendicular, respectively. Through analysis of this angular dependence one can extract the Raman tensor elements which depend on electron-phonon coupling. By exciting at 633 nm and 514 nm, it is possible to observe the sensitivity of the tensor elements to excitation energy for 19 Raman modes. We find that the mode excitation sensitivity depend strongly on their frequency which indicates that some modes couple much more strongly to electronic states than others.

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Presenters

  • Iraj Abbasian Shojaei

    University Of Cincinnati

Authors

  • Iraj Abbasian Shojaei

    University Of Cincinnati

  • Giriraj Jnawali

    University Of Cincinnati

  • Seyyedesadaf Pournia

    University Of Cincinnati

  • Samuel M Linser

    University Of Cincinnati

  • Howard E Jackson

    University Of Cincinnati

  • Leigh Smith

    University Of Cincinnati

  • Congcong Le

    Max Planck Institute for Chemical Physics of Solids

  • Fu-Chun Zhang

    Kavli Institute of Theoretical Sciences, University of the Chinese Academy of Sciences, Kavli Institute of Theoretical Sciences, University of the Chinese Academy of Science

  • Brenden Ortiz

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

  • Stephen D. Wilson

    Materials Department, UC Santa Barbara, Materials Department, University of California, Santa Barbara, California 93106-5050, USA, Materials, University of Santa Barbara, Materials Department, University of California, Santa Barbara