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SUMMARY:Physical Chemistry Seminar: Luminescent Organic Triplet Diradicals
  as Optical-Spin Interfaces
DTSTART:20251204T171500
DTEND:20251204T181500
DTSTAMP:20260506T144701Z
UID:ff1fd4fe55c9f42211650e3ccf2ca47a8002d833ae13b0fce9b466b9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Michael Wasielewski\, Northwestern University\, Evanston
  IL (USA)\nMolecular optical-spin interfaces are emerging as promising alt
 ernatives to solid state defects such as diamond nitrogen vacancy (NV) cen
 ters for quantum information science applications. We will report on a new
  theory-guided approach to molecular optical-spin interfaces that utilizes
  two covalently linked luminescent tris(2\,4\,6-trichlorophenyl)methyl (TT
 M) radicals to produce a diradical with a triplet ground state. These dira
 dicals have photophysics and spin properties very similar to those of NV c
 enters yet can be spatially arranged at the atomic scale. We have examined
  these diradicals both in glassy solvents and doped into single crystals o
 f their structurally isomorphous diamagnetic precursors. Optical polarizat
 ion of the T0 sublevel of the triplet ground state is achieved by spin-sel
 ective excited-state intersystem crossing from the T+1 and T-1 sublevels o
 f the triplet excited state. The triplet ground state as characterized by 
 pulse electron paramagnetic resonance spectroscopy shows spin coherence ti
 mes of 4 ms at 85 K increasing to 20 ms at 5 K. Also\, coherent microwave 
 manipulation of the spin-polarized ground state populations and coherences
  was demonstrated using optically detected Rabi nutations\, Hahn echo form
 ation\, and echo decay measurements. This marks an important step towards 
 leveraging the favorable spin relaxation times of organic molecules for ap
 plications as quantum sensors.\n\nAn apéro will be served after the semin
 ar! \n 
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495 https://epfl.
 zoom.us/j/67330062092?pwd=iQ2Z9fizba1qbJ6yn7IaItj53u5iqq.1
STATUS:CONFIRMED
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