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DTSTAMP:20260424T143506Z
UID:1761121800@ist.ac.at
DTSTART:20251022T103000
DTEND:20251022T113000
DESCRIPTION:Speaker: Shaul Katznelson\nhosted by Charles Roques-Carmes\nAbs
 tract: Hanbury Brown and Twiss (HBT) interferometry\, originally developed
  to measure stellar diameters\, has become a central technique in quantum 
 optics\, offering insight into photon statistics and coherence. We apply t
 ime-resolved second-order correlation (2) () measurements to explore scint
 illation—the light emission following high-energy radiation excitation
 —in a range of condensed matter systems. Our study reveals strong photon
  bunching in rare-earth-doped garnets and perovskite nanocrystals\, enabli
 ng precise extraction of scintillation lifetimes and light yields with sen
 sitivity to temperature and X-ray flux. In nanocrystal superlattices just 
 hundreds of nanometers in size\, we observe (2) (0) values exceeding 50\, 
 demonstrating the intrinsic bunching effects scintillated light have. Beyo
 nd intrinsic emission analysis\, we report a collective radioluminescence 
 phenomenon in ensembles of coupled perovskite quantum dots under X-ray exc
 itation. Here\, a single high-energy photon triggers multiple synchronized
  excitations via photoelectrons\, producing superfluorescent emission with
  broadened spectra\, shifted peaks\, and ultrafast lifetimes down to 230 p
 s—14× faster than roomtemperature spontaneous emission. These observati
 ons align with many-body quantum optics theory and establish a new mechani
 sm for enhancing scintillation. ***Shaul is currently completing his Ph.D
 . at the Technion – Israel Institute of Technology in the AdQuanta group
 \, under the supervision of Prof. Ido Kaminer. His research integrates qua
 ntum optical techniques and effects—such as Hanbury Brown and Twiss (HBT
 ) interferometry and superfluorescence—with X-ray science\, aiming to en
 hance the performance of X-ray radiation detectors. Shaul will join ISTA a
 s a postdoctoral researcher in 2026. Previously\, he earned his M.Sc. in M
 aterials Engineering at the Technion\, working under the supervision of Pr
 of. Elad Koren. His master's research focused on monolayer transition meta
 l dichalcogenides\, specifically investigating transitions between bright 
 and dark excitonic states. He holds dual B.Sc. degrees from the Technion i
 n Materials Engineering and Chemistry.
LOCATION:Mondi 3 / Central Building\, ISTA
ORGANIZER:omerhalil.unal@ist.ac.at
SUMMARY:Shaul Katznelson: Probing scintillation physics and collective emis
 sion with quantum optics methods
URL:https://talks-calendar.ista.ac.at/events/5832
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