<< February 2015 >>
 
 >>
 >>
 >>
 >>
Sun Mon Tue Wed Thu Fri Sat
 1   2   3   4   5   6   7 
 8   9   10   11   12   13   14 
 15   16   17   18   19   20   21 
 22   23   24   25   26   27   28 
 
Add an Event Edit This Event

This Week at Physics

<< Fall 2014 Spring 2015 Fall 2015 >>
Subscribe to receive email announcements of events

Event Number 3613

  Monday, February 9th, 2015

R. G. Herb Condensed Matter Seminar
Faculty Candidate Seminar
Surface Plasmons and Impurity States in Graphene
Time: 4:00 pm
Place: 4272 Chamberlin Hall
Speaker: Victor Brar , California Institute of Technology
Abstract: Graphene, an atomically thin sheet of carbon atoms, provides a unique platform to study quasiparticle interactions and to create optical metamaterials with novel properties. The 2D nature and linear band structure of graphene give rise to a semi-metal behavior, with tunable dielectric properties and a high electron mobility. In the DC regime, these properties allow graphene to display novel screening behavior in the presence of charged impurities, which I will show can be probed directly using scanning tunneling spectroscopy (STM). At optical (mid-IR) frequencies, the graphene dielectric function is strongly perturbed by the presence of collective excitations known as surface plasmon polaritons (SPPs), which are optical modes - supported by free carriers - that are bound to the graphene sheet. These modes show a number of remarkable properties, including a carrier density dependent dispersion relation, and wavelengths that are more than 100 times shorter than freespace. I will show how the surface plasmons in graphene can be harnessed to create infrared metasurfaces that have tunable optical properties. These materials will be shown to exhibit extreme light-matter interactions that can control the macroscopic absorption and emission properties of nanostructured dielectric stacks.
Host: Coppersmith
Add this event to your calendar

©2013 Board of Regents of the University of Wisconsin System