Abstract
Few-layered crystalline materials tend to show significant changes in physical properties due to the reduction of spatial dimensions. Some well-studied 2D materials, such as graphene and transition metal dichalcogenides (TMDs), have shown unique electronic properties as well as optical properties in visible and near-IR range. Aside from optical transitions in several electronvolts, these systems also host low-energy physical phenomena in the range of tens to hundreds of millielectronvolts, corresponding to mid-IR and terahertz range in optics. However, these long-wave optical properties are less studied in previous research. In this project we propose to study the low-energy behavior in these 2D materials, e.g. low-energy gapped system, transition between exciton levels, coupling with mid-IR cavity and generation of low-energy photons through nonlinear processes. These studies include a variety of optical measurements in mid-IR and terahertz range and could hopefully extend our knowledge into physics of this kind of materials.
Anyone interested is welcome to attend.