Monday, March 26, 2018 - 2:00pm - 3:00pm
Michael Fogler (University of California, San Diego)
Electrons in pristine solids behave as a hydrodynamic fluid in a certain range of temperatures and frequencies. We show that the response of such a fluid to an electromagnetic field is different from what is predicted by the usual kinetic theory. Certain aspects of this response are universal, for example, a direct relation between the linear and second-order nonlinear optical conductivities. Graphene is a particularly interesting material where this physics can be studied. We show that two types of collective modes should exist therein.
Friday, May 19, 2017 - 9:20am - 9:40am
Shiang Fang (Harvard University)
The two-dimensional layered materials are very interesting classes of materials, which can host a variety of physics properties such as topological phases, charge density waves, superconductivity and magnetism. To overcome the theoretical challenges in simulating the applications with these materials, we employ the Wannier transformation technique to bridge the ab initio density functional theory calculations and the efficient tight-binding models.
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.
Tuesday, May 16, 2017 - 4:50pm - 5:30pm
Boris Yakobson (Rice University)
Comprehensive tools of materials modeling are derived from the principles of physics and chemistry, empowered by high performance computing. Together, this allows one to make verifiable predictions of novel physical structures with specific, often useful or even extraordinary, properties. Examples from our work will be presented, first being growth and unusual morphology of graphene and of binary compositions like metal dichalcogenides MX2 [1], where a combination of DFT and phase-field simulations proves useful.
Wednesday, May 17, 2017 - 2:00pm - 2:40pm
Paul McEuen (Cornell University)
What new things can we make from 2D Materials? The possibilities are incredibly varied, from novel quantum systems to functional nanoscale machines. In this talk, I'll discuss three things we've built: a tunable 2D exciton, a thermal guitar, and a new class of self-folding origami devices.
Thursday, April 27, 2017 - 4:00pm - 5:00pm
Dimitri Basov (Columbia University)
I will discuss recent nano-optical experiments on quantum materials including: transition metal oxides undergoing the insulator to metal transition and graphene. Central to the nano-optical exploration of quantum materials is the notion of polaritons: hybrid light matter modes that are omnipresent in polarizable media.
Thursday, April 27, 2017 - 2:30pm - 3:30pm
Avik Dutt (Columbia University)
Novel materials such as silicon nitride and graphene can be integrated within the framework of silicon photonics to demonstrate interesting phenomena in the quantum as well as classical realms, and consequently enable new applications.
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