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BEGIN:VEVENT
DTSTAMP:20260424T113934Z
UID:1687771800@ist.ac.at
DTSTART:20230626T113000
DTEND:20230626T123000
DESCRIPTION:Speaker: Zhanybek Alpichshev\nhosted by Misha Lemeshko\nAbstrac
 t: Lead halide perovskite are remarkable in many respects. Even samples wi
 th relatively unassuming quality were demonstrated to exhibit some of the 
 most fundamental phenomena in semiconductor physics\, such as laser coolin
 g and room-temperature quantum coherence in the form of super-radiance. Pe
 rovskites are also known for their “resilience” against formation of d
 eep defects that can act as charge traps\, making them excellent materials
  for photo-voltaic applications: perovskite-based solar cells have recentl
 y nearly reached the levels of the state-of-the-art conventional Si- based
  devices in terms of efficiency. Amongst these achievements\, perhaps the 
 most puzzling fact is that there is still no clear understanding as to wha
 t is underlying this remarkable performance in the microscopic level.In th
 is presentation I will discuss how much can one learn about the basic prop
 erties of perovskites by means of optics. I will show how classic measurem
 ents on the paradigmatic perovskite CH3NH3PbBr3 in a broad wavelength rang
 e\, reveal that in order to account for the experiment even on the qualita
 tive level\, one needs to amend the usual minimal coupling scheme and to i
 ntroduce an atomic-level coupling between electric field and the spin degr
 ee of freedom (!). As it turns out this term has far-reaching consequences
  for the low-energy properties of perovskites and can account for many of 
 puzzling aspects of perovskite phenomenology\, as well as predict unexpect
 ed novel physics in this class of materials.
LOCATION:Raiffeisen Lecture Hall\, ISTA
ORGANIZER:arinya.eller@ist.ac.at
SUMMARY:Zhanybek Alpichshev: Shining light on Lead-Halide Perovskites: what
  optics can tell about the inner workings of the Solar-Cell-champion mater
 ial
URL:https://talks-calendar.ista.ac.at/events/3971
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