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SUMMARY:Many-Body Elastic Scattering of Exciton Polarons in Organic-Inorga
 nic Hybrid Perovskites
DTSTART:20190606T171500
DTEND:20190606T181500
DTSTAMP:20260916T225612Z
UID:692a0ef3fec2b1be26563fd88020b7f44d106c7fbf85f062ea376092
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Carlos Silva\nGeorgia Institute of Technology USA\nOwing
  to both electronic and dielectric confinement effects\, two-dimensional o
 rganic-inorganic hybrid perovskites sustain strongly bound excitons at roo
 m temperature. The intrinsic optical line-shape reflects multiple excitons
  with distinct binding energies\, each dressed differently by the hybrid l
 attice. Given this complexity\, a fundamentally far-reaching issue is how 
 Coulomb-mediated many-body interactions elastic scattering such as excitat
 ion-induced dephasing\, inelastic exciton bimolecular scattering\, and mul
 ti-exciton binding depend upon the specific exciton-lattice coupling. We r
 eport the intrinsic and density-dependent exciton pure dephasing rates and
  their dependence on temperature by means of a coherent nonlinear spectros
 copy. We find exceptionally strong screening effects on multi-exciton scat
 tering relative to other two-dimensional single-atomic-layer semiconductor
 s. Importantly\, the exciton-density dependence of the dephasing rates is 
 markedly different for distinct excitons. These findings establish the con
 sequences of particular lattice dressing on exciton many-body quantum dyna
 mics\, which critically define fundamental optical properties that underpi
 n photonics and quantum optoelectronics in relevant exciton density regime
 s.\n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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