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DTSTAMP:20240329T110054Z
UID:https://www.fhi.mpg.de/events/25442/72594
DTSTART:20200730T130000Z
CLASS:PUBLIC
CREATED:20200727T101443Z
DESCRIPTION:Change notice: PC Online Talk\nThe ultrafast polarization respo
nse to incident light and ensuing electronic excitations are essential to
the outstanding optoelectronic properties of lead halide perovskites (LHPs
). In recent studies\, a dynamically disordered structure and anharmonic c
rystal lattice was suggested to be a key component for LHPs’ complex pol
arization dynamics1\,2. In this work\, we develop a novel type
of two-dimensional spectroscopy to spectrally resolve and disentangle cont
ributions to the ultrafast Kerr-effect in MAPbBr3 and its all-i
norganic counterpart CsPbBr3. This technique allows us to energ
etically dissect broadband light propagation and dispersive polarization r
esponses in the vicinity of the electronic bandgap. Light propagation in L
HPs is in particular technologically relevant for solar cell\, light modul
ation and LED applications due to stimulated emission\, polariton condensa
tion and photon recycling which may take place in the investigated spectra
l region3\,4. In both LHPs\, we find intense nonlinear mixing o
f anistropically propagating light fields\, resulting in an oscillatory po
larization response\, which strongly depends on the crystallographic phase
and the position of the electronic bandgap. We further exploit temperatur
e-dependent two-dimensional optical Kerr-effect (2D-OKE) fingerprints to q
uantify the dispersion anisotropy via an analytic model. In addition to re
vealing highly dispersive anisotropic light propagation and its nonlinear
mixing\, this study finally establishes a unified origin of ultrafast Kerr
responses in single crystal LHPs near the optical bandgap. 1. Miyata\, K.
et al. Sci Adv 3\, e1701217 (2017). 2. Zhu\, H. et al. Scie
nce 353\, 1409 (2016). 3. Pazos-Outón\, L. M. et al. Science 351\,
1430 (2016). 4. Su\, R. et al. Nature Physics 16\, 301–306 (2020
).\nSpeaker: Dr. Sebastian Mährlein
LAST-MODIFIED:20200727T101443Z
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SUMMARY: Polarization Dressed Light Propagation in Lead Halide Perovskites
in Lead Halide Perovskites
URL:https://www.fhi.mpg.de/events/25442/72594
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