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CATEGORIES:Academics,Lectures & conferences
DESCRIPTION:Short Time Dynamics of Photoexcited Carriers of Methylammonium
Lead Iodide Perovskites at Room Temperature (Maria Muñoz)\n\nAbstract:\n\n
Since the rise of the concept of quantum materials (QM)\, these materials d
escribed as many-body quantum systems (interacting atoms\, molecules\, or e
lectrons) have been suitable for many optoelectronic and quantum applicatio
ns. Additionally\, there has been significant interest in the research of Q
M to understand underlying physics behind their extraordinary optical prope
rties. Examples of QM are ultracold atoms\, layered 2D semiconductors\, sup
ramolecular materials\, and more. In 2012\, a high energy conversion effici
ency over 10% was reported for the first time\, for metal-halide perovskite
(MHP) solar cells\, opening a new era for photovoltaics research. The repo
rted efficiencies have been improved to 22.7%\, over the years. Additionall
y\, these exceptional semiconductor MHP materials are also promising candid
ates for the new generation of optoelectronics. This research focuses on th
e study of many-body interactions and their dynamics of methylammonium lead
iodide (MAPI) CH3NH3PbI3 thin film materials at room temperature.\n\nIn th
is work\, Maria Muñoz utilized cutting-edge optical spectroscopies techniqu
es to study ultrafast dynamics of photoexcited electron-holes pairs in MAPI
perovskites films. She first performed steady-state spectroscopic measurem
ents to characterize the sample\, then implemented optical 2D coherent spec
troscopy in the nonlinear geometry to probe the ultrafast dynamics. Her exp
eriment revealed many-body couplings and ultrafast dynamics of free-carrier
and exciton resonances that coexist for a few hundreds of femtoseconds. Th
e data revealed the charge-carrier relaxation dynamics after the excitation
of the sample in terms of thermalization\, cooling\, exciton dissociation\
, and many-body effects. Furthermore\, those dynamics showed dependance on
the excitation control variables\, such as wavelength excitation and photoe
xcited carrier density generated.\n\nShort Range Quark-Quark Interactions a
nd Nucleon Structure Function at High Bjorken x (Joseph Maerovitz)\n\nAbstr
act:\n\nWe are studying the nucleon structure using QCD and the interior in
teractions. We model the nucleon as a valence quark system and a residual s
ystem. We model the valence quark momentum distribution and structure funct
ion using three mechanisms: mean field\, two quark short range correlations
and\, three quark short range correlations calculated by Light Front Diagr
ammatic methods in leading order approximation. The previous study of the m
ean field model set the parameters of the short-range correlations which ha
ppens at higher momentum fraction x. The short-range correlations of the va
lence quarks emit hard gluon exchanges. In the calculation we considered bo
th two- and three-quark short range interactions through hard gluon exchang
e which are calculated within perturbative QCD.
DTEND:20211203T190000Z
DTSTAMP:20230609T084438Z
DTSTART:20211203T180000Z
LOCATION:PG6\, 112
SEQUENCE:0
SUMMARY:Physics Colloquium: Student presentations Maria Muñoz\, Joseph Maer
ovitz
UID:tag:localist.com\,2008:EventInstance_38492231879952
URL:https://calendar.fiu.edu/event/physics_colloquium_student_presentations
_maria_munoz_joseph_maerovitz
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