A. Novel 2D Materials & Heterostructures

Beyond the study of graphene in the past decade, the discovery of other two-dimensional (2D) materials, like hexagonal-Boron Nitride (h-BN) and Molybdenum Disulfide (MoS2), have opened new doors in materials science and condensed matter physics. These materials exhibit a variety of interesting properties from high-bandgap insulators to semiconductors to semi-metals. Further, combing 2D materials with distinct properties into heterostructures, or engineering their shape and size on the nanoscale, provides a scientific and technological dreamscape to explore new physics and create new functionality.

In the Femtosecond Spectroscopy Unit, we have been studying the novel material properties that are generated at the interfaces of the 2D interfaces, as well as properties resulting from the interaction of dissimilar 2D materials.

Recent efforts in the group have shown the ability to optically induce magnetic properties in graphene nanostructures [1], observe emergent opto-electronic behavior in graphene and h-BN heterostructures [2], and study the influence of substrate interaction on the opto-electronic properties of semiconducting MoS2 [3].

Work continues to be directed towards developing new, and novel 3D heterostructure materials made by assembling 2D layers with designer compositions and 3D architectures; studying ultrafast charge transfer in few layer devices; and studying the interactions of few layer structures with their substrate.

[1] E. Kavousanaki and K. M. Dani. Phys. Rev B 91, 035433 (2015)

[2] B. M. Krishna, et al. Adv. Opt. Mater. Published (2015).

[3] Michael K. L. Man, et al. In preparation.