Coherent Spin Excitons from Singlet Fission

Prof Joel Eaves, University of Colorado at Boulder, USA

Thursday, May 29,  2025, 11:00 AM, Los Angeles Seminar Room

Abstract: Singlet fission, a rare photophysical phenomenon that splits one singlet excited state
into two excited triplets, has attracted much attention as a pathway to next generation
solar cells. But the two-triplet biexciton state is also spin-entangled, and under the
right conditions, may serve as a quantum resource for information and computing
applications.
Using quantum relaxation theory on a model Hamiltonian, I will discuss the design
principles for building molecules that sustain spin coherence in the exciton pair. I will
also how a nonadiabatic dynamical theory can assign time-resolved electron
paramagnetic resonance spectroscopy that measures the fates of the various biexciton
products in molecules and crystals.