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UID:DSC-22128
DTSTART;TZID=Europe/Berlin:20260727T163000
SEQUENCE:1782797947
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260727T173000
URL:https://dresden-science-calendar.org/calendar/de/detail/22128
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Cocchi: Atomistic Engineering of Colloidal Transition-Metal-Dichalc
 ogenide Quantum Dots
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Caterina Cocchi\nInstitute of Speaker: Friedrich
 -Schiller-Universität Jena\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS 
 ()\n  Street: Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49
  (0)351 871 0\n  Fax: \nDescription: Colloidal transition metal dichalcoge
 nide (TMD) quantum dots (QDs) represent highly tunable platforms for next-
 generation optoelectronic\, catalytic\, and spintronic applications. Howev
 er\, their functional performance is often dictated by the interplay betwe
 en quantum confinement and topology\, fundamental material characteristics
  that are hard to identify and disentangle in experiments. In this talk\, 
 I will show how ab initio simulations can shed light on the complex phenom
 ena behind exciton quenching and magnetism in TMD QDs. Focusing on hexagon
 al nanoplatelets as a relevant model of colloidal TMDs\, we identify that 
 edge-located\, optically bright hole traps are responsible for sub-picosec
 ond exciton decay. These intrinsic trap states\, stemming from metal d-orb
 itals\, outcompete radiative recombination in small nanostructures but are
  simultaneously responsible for enhanced catalytic activity. Next\, we inv
 estigate the emergence of intrinsic edge magnetism in triangular MoS$_2$ n
 anoflakes. Our results reveal a critical size threshold of about 1.5 nm\, 
 above which a magnetic ground state emerges due to polar discontinuities a
 t the edges. This results in the formation of magnetic islands localized o
 n specific Mo edge atoms\, providing discrete\, addressable magnetic units
  rather than delocalized edge spins. By unraveling the fundamental physics
  of these systems\, we establish a rational basis for the design of multif
 unctional 2D nanomaterials for future technological applications\, includi
 ng spin filters\, memory elements\, and spin qubits.
DTSTAMP:20260630T131936Z
CREATED:20250728T053512Z
LAST-MODIFIED:20260630T053907Z
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