Paper 14092-51
Paper 14092-51
Photonic and nonlinear optical response of lab-grown WTe2 Weyl semimetal crystal: structure, dielectric properties, and harmonic generation
On demand | Presented live 14 April 2026 
Abstract
In this work, we present a combined experimental–theoretical investigation of tungsten ditelluride (WTe₂), a type-II Weyl semimetal in the transition-metal dichalcogenide family, structure, optical properties, and preliminary harmonic generation response using ultra-short laser pulses. High-quality WTe₂ single crystals were lab-grown by chemical vapor transport and characterized by Raman spectroscopy, energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Density functional theory (DFT) and time-dependent DFT (TDDFT) were employed to compute the dielectric function and optical absorption spectra to investigate the crystal’s anisotropic responses. Moreover, the DFT and TDDFT computational results were compared against experimental results, which show excellent agreement. Our combined study offers a comprehensive picture of WTe₂’s electronic structure and its linear and nonlinear optical responses, underscoring its potential for industrial applications.
Presenter
King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)
Dr. Watheq Al-Basheer is an Associate Professor of Optical and molecular Physics at King Fahd University of Petroleum & Minerals. In Dec. 2006, he received his Ph.D. degree in Physics from the University of Tennessee, Knoxville, the USA. He then accepted a research associate position at the University of Calgary. In 2009, he received a postdoctoral fellowship from the University of British Columbia, Vancouver Canada. In 2011, he accepted a Research Scientist position at Environment Canada before joining the KFUPM Physics department as an Assistant Professor of AMO physics in Sep. 2012. Dr. Al-Basheer is the recipient of the prestigious Natural Sciences and Engineering Research Council of Canada Fellowship. In 2013, he received the KFUPM’s International Summer Scholarly Program. He is a member of the American Physical and Chemical Societies and the Sigma Pi Sigma Honorary American Physics Society. He has authored and co-authored many US patents and papers in high-impact journals.
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