ABSTRACT:
The growing families of two-dimensional crystals derived from naturally occurring van der Waals materials offer an unprecedented platform to investigate elusive physical phenomena and could be of use in a diverse range of devices. Of particular interest are recently reported atomic sheets of non-van der Waals materials, which could allow a better comprehension of the nature of structural bonds and increase the functionality of prospective heterostructures. We will present the opto-structural properties of ultrathin non-van der Waals InGaS3 sheets produced by standard mechanical cleavage. Our ab initio calculation results suggest an emergence of authentically delicate out-of-plane covalent bonds within its unit cell, and, as a consequence, an artificial generation of layered structure within the material. Those yield to singular layer isolation energies of ~ 50 meVÅ-2, which is comparable with the conventional van der Waals material’s monolayer isolation energies of 20 – 60 meVÅ-2. In addition, we will provide a comprehensive analysis of the structural, vibrational, and optical properties of the materials presenting that it is a wide bandgap semiconductor with a high-refractive index and negligible losses in the visible and infrared spectral ranges. This makes it a perfect candidate for further establishment of visible-range all-dielectric nanophotonics.
BIOGRAPHY:
Dr. Davit Ghazaryan is an expert in two-dimensional (2D); materials and physics. Dr. Ghazaryan received a Bachelor’s degree in Radiophysics from the Yerevan State University in 2012. In 2014, he received his Master’s degree in Physics from Moscow Institute of Physics and Technology, and later on, in 2018, his Ph.D. in Physics from University of Manchester, for his work on Tunneling Spectroscopy in van der Waals Heterostructures. Dr. Ghazaryans’ current research interests lie in twistronics and emergent phenomena in van der Waals materials and optics of non-van der Waals materials. Dr. Ghazaryan is a Senior Research Fellow and Associate Professor at the Center for Photonics and 2D Materials of Moscow Institute of Physics and Technology since June of 2020.