Our research interests lie in understanding the phenomena arising from strong electronic correlations at nano-scales and employing these phenomena for novel applications. Unlike the standard materials used in the semiconductor industry, degrees of freedom exist in strongly correlated materials that could significantly impact electronic and optoelectronic technology. As a part of that research, we develop/implement, use and improve the latest nano-fabrication, physical and chemical vapor deposition, electronic transport, and optical measurement techniques. See below for further details.
When the interactions between electrons with other electrons and phonons in a material are comparable to the average kinetic energy of the electrons, the band structure model and associated Fermi liquid theory fails to capture the exotic phenomena observed. Metal-insulator transition, high critical temperature superconductivity, giant magnetoresistance and heavy-fermion effects are just a few examples of the phenomena emerging from the strong correlations. Part of our research is focused on understanding the phenomena emerging from the strong correlations in materials using experimental methods and applying this practical understanding to technologically useful applications. Our expertise on crystal growth, novel device fabrication techniques, measurement techniques in optics and electronic transport, and understanding of strongly correlated systems helps us to study novel phenomena and possible devices employing strongly correlated materials. Our research is especially focused on the metal-insulator transition of vanadium dioxide, which is an examplary strongly correlated material with a transition temperature of 67 celcius and it is stable under ambient conditions. We study nano crystals of VO2 using optics and electronics to achieve applications in electronics and hydrogen related applications.
The discovery of graphene has created a new research area on its own and it is one of the leading topics in condensed matter physics and materials science. Peculiar properties of graphene have attracted waves of attention both for fundamental science and for applications. In recent years, this interest spread to other layered materials such as transition metal dichalcogenides (TMDCs), transition metal oxides, and other graphene-like materials such as boron nitride, silecene, germanene etc. The reason is mainly new nano-fabrication techniques that allow researchers to tailor devices by stacking these layered materials at will to study applications in electronics and optoelectronics, as well as fundamental phenomena. Many applications in electronics, flexible and transparent optoelectronics, photovoltaics, photodetection and photoemission using peculiar electronic, spin, orbital and valley interactions of 2D layered material heterostructures have already been proposed and some of them studied. Strain in such materials plays an important role in material parameters such as conductivity, mobility, band gap, magnetization, valley effects etc. Using scanning Hanle, Kerr, photocurrent microscopy, micro-Raman and photoluminescence spectroscopy we are going to study the effects of strain on the properties of layered materials and purpose made heterostructure devices.