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.

*We acknowledge the financial support of the NSF through grants DMR 1507844, DMR 1531373, and ECCS 1509706. S.D.W. acknowledges the support of UCSB Quantum Foundry, NSF DMR-1906325 and NSF DMR-1720256. CL and FZ acknowledge NSF of China through grant 11674278.

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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