Conférence de Philippe GUYOT-SIONNEST (Université
de Chicago, Illinois, USA) le jeudi 18 juin 2009
à 16 h, CINaM (salle Raymond Kern), Campus de Luminy,
Marseille : «Optical and electronic studies of nanoscale
colloidal systems».
Résumé
I will report on some of my activities in nanoscale colloidal
materials. With spherical core/shell colloidal semiconductor dots,
I will discuss the optical properties and dynamic behavior,
associated in particular with Auger multiparticle decay, trion
decay, and intraband relaxation contrasting with similar issues for
MBE grown quantum dots. Electronic transport in assemblies of the
colloidal dots is also demonstrated with a long-term goal of
improved mobilities. At present the behavior is mostly similar to
disordered semiconductor but there is a novel magneto- transport
property, attributed to spin-blockade due to the low density of
states. With colloidal metal particles, my interest in primarily on
the control of Plasmon frequency, linewidth and local field
enhancement that might be achievable and I will describe some
results on a rather monodispersed sharp bipyramid Au colloidal
structure.