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DTSTART:20181217T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/842670-surface-scienc
 e-on-the-nanoscale-and-optical-analogs-of-2d-nmr-patanjali-kambhampati-mcg
 ill
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Surface Science on the Nanoscale and Optical Analogs of 2D-NMR - Pa
 tanjali Kambhampati (McGill)
DESCRIPTION:Surface Science on the Nanoscale and Optical Analogs of 2D-NMRP
 atanjali KambhampatiDepartment of ChemistryMcGill University
\nAbstract: T
 o be discussed are two new directions in our research group that have emer
 ged from a decade of work on ultrafast exciton dynamics in semiconductor n
 anocrystals. In both cases we connect classical ideas in physical chemistr
 y to new opportunities in materials science.
\nThe semiconductor nanocryst
 al is a cluster on the length scale of 1 – 10 nm\, at which point quantu
 m confinement effects arise. In this regime one has the standard quantum d
 ot\, characterized by excitons\, now well understood. By virtue of their s
 mall size\, these nanocrystals also have pronounced surface effects. Despi
 te its importance the nanoscience community’s understanding of the surfa
 ce of these materials is in its infancy. Using simple temperature dependen
 t fluorescence spectroscopy\, we have shown that the surface can be unders
 tood in terms of classical concepts from molecular electron transfer theor
 y. We report here on recent chemical and spectroscopic work that reveals h
 ow the surface of semiconductor nanocrystals may be understood\, controlle
 d\, and exploited.
\nFor a decade our group has employed State-Resolved Pu
 mp/Probe spectroscopy to probe ultrafast exciton dynamics in semiconductor
  quantum dots. These time resolved spectroscopies with one frequency dimen
 sion have indeed been useful\, but newer multidimensional time-resolved me
 thods have been available for over a decade. These sophisticated Coherent 
 Multidimensional Spectroscopy (CMDS) experiments\, can be considered as op
 tical analogs to 2DNMR\, albeit with complex beam geometries. Our recent w
 ork using laser pulse shaping approaches shows how one can create femtosec
 ond laser pulse trains that are suitably modulated in an automated and pro
 grammable manner so as to enable CMDS in a fully collinear approach using 
 all-optical readout.
\nBio: Dr. Kambhampatiis an Associate Professor in th
 e Department of Chemistry at McGill University and is an internationally r
 ecognized expert on semiconductor quantum dots and ultrafast laser spectro
 scopy. The quality of the research is evidenced by the number of departmen
 tal colloquia delivered at leading institutions. Representative department
 s in which he has lectured include\, MIT\, Princeton\, Columbia\, Pennsylv
 ania\, Toronto\, U of Chicago\, Northwestern\, Illinois\, Wisconsin\, Mich
 igan\, Texas\, Washington\, UCLA\, USC. The quality of this work is also e
 videnced by the work generating five invited review articles in four years
 .
\nFor more information\, see the group web page of Prof. Kambhampati
\nC
 ette conférence est présentée par le RQMP Versant Nord du Départeme
 nt de physique de l'Université de Montréal et de Génie physique de l
 a Polytechnique.
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