I am a researcher in condensed matter physics. My major interest is quantum transport through mesoscopic systems in ordered and disordered systems. Graphene is one of the most promising materials for application in nano-electronics. Graphene opened a hot topic research line on new 2D materials which leads to hetero-structure systems composed of layers of 2D materials integrated layer by layer on each other. Moreover, recently, topological insulators as a new quantum phase of materials, have attracted great theoretical and experimental attentions.