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BEGIN:VEVENT
DTSTAMP:20260427T184238Z
DTSTART;VALUE=DATE-TIME:20260202T130000
DTEND;VALUE=DATE-TIME:20260202T140000
SUMMARY:WCPM: Linn Leppert\, University of Twente
TZID:Europe/London
UID:20260202-8ac672c49b9d1da0019b9d9f989905e0@warwick.ac.uk
CREATED:20260108T204904Z
DESCRIPTION:Networking Lunch: The Recharge Room\, next to Lecture Theatre
  004\, from 12:30pm - 1pm. Title: Excitons in low-dimensional metal-hali
 de perovskites from first principles Abstract: Excitons\, neutral quasip
 articles formed by electron-hole pairs\, play a key role in the optoelec
 tronic properties of semiconductors. Understanding their formation\, tra
 nsport\, and dissociation is essential for interpreting experiments\, pr
 edicting material behavior\, and designing new materials for targeted ap
 plications. Low-dimensional halide perovskite semiconductors provide a v
 ersatile platform for studying excitons due to their structural tunabili
 ty and ease of fabrication. Quasi-two-dimensional (2D) halide perovskite
 s\, consisting of metal-halide octahedral layers separated by organic sp
 acers\, are particularly promising. Their unique structure\, which disru
 pts octahedral connectivity in one direction\, results in anisotropic ch
 arge-carrier masses and dielectric screening\, promoting the formation o
 f strongly bound excitons. First-principles calculations of excitonic pr
 operties in these materials have been limited by the large unit-cell siz
 es of most experimentally synthesized quasi-2D perovskites. However\, re
 cent advances in hardware and many-body perturbation theory methods\, su
 ch as the GW and Bethe-Salpeter Equation approaches\, now enable detaile
 d insights into these systems. In this presentation\, I will showcase ho
 w these calculations provide a microscopic understanding of the experime
 ntally observed polarization dependence of intra-\, interlayer and charg
 e-transfer excitons. Additionally\, I will discuss the influence of chem
 ical composition\, layer spacing\, and stacking on excitonic behavior\, 
 shedding light on possibilities for tuning the optoelectronic properties
  of these complex semiconductors. These insights lay the groundwork for 
 advancing the design of next-generation optoelectronic devices\, leverag
 ing the unique excitonic properties of low-dimensional perovskites. Bio:
  What do solar cell panels and the purple bacterium Rhodobacter sphaeroi
 des have in common? Both convert the sun light into other useful forms o
 f energy. And while the physical and chemical processes at the heart of 
 these light-converting systems are very different\, the relevant steps o
 f charge excitation and charge and energy transport can be described by 
 the same set of fundamental quantum mechanical equations. A theoretical 
 physicist by training\, Linn has found herseld gravitating towards topic
 s at the nexus of physics\, (bio)chemistry and material science. She enj
 oys working interdisciplinary and communicating with experimentalists an
 d theoreticians alike. In her group\, she uses and develops accurate ele
 ctronic structure methods to simulate the electronic structure and dynam
 ics of complex light-harvesting systems\, both natural and man-made.
LOCATION:Lecture Theatre 0.04 IMC
CATEGORIES:WCPM
LAST-MODIFIED:20260108T204904Z
ORGANIZER;CN=Jin Kang:
END:VEVENT
END:VCALENDAR