2D materials

Thursday, March 29, 2018 - 2:00pm - 3:00pm
Dionisios Margetis (University of Maryland)
In this talk, I will discuss macroscopic consequences of the optical conductivity of 2D materials via classical solutions of Maxwell's equations. In this context, the phase of the conductivity plays a key role. I will formally show that: (I) The homogenization of Maxwell's equations for periodic structures made of 2D materials intercalated in conventional dielectrics allows for propagation of waves with nearly no phase delay (epsilon-near-zero behavior).
Wednesday, May 17, 2017 - 9:00am - 9:40am
Steven Louie (University of California, Berkeley)
In this talk, we present some new physical phenomena found in recent theoretical studies of atomically thin two-dimensional (2D) materials. Because of reduced dimensionality, interaction and symmetry effects as well as environmental screening effects dominate many properties of these systems, leading to manifestation of concepts and phenomena that may not be so prominent or have not been seen in bulk materials.
Thursday, May 18, 2017 - 2:50pm - 3:30pm
Dionisios Margetis (University of Maryland)
Surface-plasmon polaritons (SPPs) are evanescent electromagnetic waves of relatively short wavelength that may be excited on conducting, 2D materials. These waves are macroscopic manifestations of the coupling between the incident radiation and the electron plasma. In this talk, I will discuss recent analytical progress in understanding the effect that geometry, e.g., the presence of sharp edges, may have on features of the SPP. In particular, I will describe how the curvature of the dielectric substrate can influence the SPP dispersion.
Wednesday, May 17, 2017 - 9:50am - 10:30am
Efthimios Kaxiras (Harvard University)
The inherent limitations of graphene in the context of electronic applications due to the absence of a band-gap can be overcome by combining it with materials that are intrinsically semiconducting (like the family of transition metal dichalcogenides) or insulating (like hexagonal boron nitride). Combinations of such materials in layered heterostructures provide interesting opportunities to improve and manipulate their intrinsic properties due to the weak van der Waals interaction between layers, which preserves their basic character but allows for important variations.
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