2d materials to the molecules

In this talk I will try to motivate about the two research directions which I would like to pursue in future: Transport in 2d materials and their heterostructure and quantum transport in molecules. These two research projects stem directly from my experience during the last nine years of research in the field of mesoscopic transport at low temperature during my PhD and post-doctoral research. 
I will first discuss about the transport and noise measurements in graphene and show that resistance fluctuation or noise can be used to detect the bandstructure of graphene. Moreover, noise can be a direct probe to understand the quantum transport in single layer graphene. For the first time we observed the enhanced universal conductance fluctuations (UCF) in graphene which is the direct consequence of the presence of two independent valleys. 

The main focus of my post-doctoral work has been studying two-dimensional materials having high spin-orbit coupling through electronic transport measurements at low temperatures (down to ~ 70 mK). I will highlight the results on InAs/GaSb composite quantum well, where we find the signature of quantum spin Hall effect. Apart from that I will discuss the results on the 2d hole gas, another system with high spin-orbit coupling. 

I will then discuss about the open problems in the field of 2d materials and their heterostructure. Particular attention will be given towards the prediction of quantum spin Hall effect in 2d transition metal dichalcogenides (TMDC). 

The other direction is the quantum transport of molecules. Molecules have typical energy level spacing ~ eV that are much larger than the thermal energy at 300 K (~25 meV), making it possible to observe quantum phenomena at room temperature similar to the “Aharonov-Bohm” effect observed in metal rings at very low temperatures. I will discuss the recent experiments on quantum interference in molecules and about the possibility of tuning the quantum interference in situ. Finally, I will show that how one can contact a single molecules between two metal leads and study the physics of single molecule through transport.