15 Ottobre 2014 - Ore 16:30 - Seminario di Dipartimento - Andrea Tomadin - Optoelectronics in graphene
Relatore: Andrea Tomadin
Luogo: Aula Newton
E-mail organizzatore: raffaella.burioni@fis.unipr.it
Abstract:
Graphene, a two-dimensional honeycomb crystal of carbon atoms, has been
the object of an astounding research effort since its electronic
properties were first measured in the mid 2000s. The peculiarity of
graphene being a transparent conductor drew attention to its photonic and
optoelectronic properties and graphene was proposed as a material for
touchscreens and similar devices. Graphene fundamental plasmonic
properties were studied early on. However, since graphene plasmons
propagation and tunability were demonstrated experimentally, research to
make graphene a convenient plasmonic platform has become a very active
field. Better fabrication procedures and measurement devices will soon
allow to access quantum plasmonic effects in graphene. Moreover,
angle-resolved photoemission spectroscopy and ultrafast pump-probe
spectroscopy of graphene have allowed to measure effects of
electron-electron interactions in graphene, both in the equilibrium and in
the nonequilibrium regime. In this talk, I will present the basic graphene
properties and the theoretical description of low-energy electron physics
in graphene. I will focus on some recent results regarding (i) the
plasmonic spectrum of graphene deposited on hexagonal boron nitride; (ii)
usage of plasma waves in graphene devices for photodetection purposes; and
electron dynamics following ultrafast optical perturbations.