Disorder and Decoherence: Obstacles or Opportunities for Collective Excitations?

  • Event Date: 2024-12-23
  • Quantum information and communication
  • Speaker: Prof. Hsing-Ta Chen (Dept. of Chemistry and Biochemistry, University of Notre Dame, USA)  /  Host: Prof. Yueh-Nan Chen (NCKU)
    Place: R36173, 1F, Dept. of Physics, Building of Science College, NCKU

Time:12:10, Monday, December 23, 2024
Speaker:Prof. Hsing-Ta Chen
              Dept. of Chemistry and Biochemistry, University of Notre Dame, USA
Title: Disorder and Decoherence: Obstacles or Opportunities for Collective Excitations?
Place : R36173, 1F, Dept. of Physics, Building of Science College, NCKU

Abstract:
Harnessing strong light-matter interactions between molecular/material excitations and confined electromagnetic fields opens up new opportunities to manipulate chemical reactivity and charge transport at the microscopic level. Recent reports demonstrate that, as electronic or vibrational excitations of a molecular ensemble are strongly coupled with photon modes (for example near a plasmonic nanoparticle or within a microcavity), collective, delocalized excitations among molecules lead to intriguing phenomena that are fundamentally distinct from conventional photoexcitation. However, significant discrepancies between theoretical predictions and experimental observations often stem from the neglect of molecular disorder and photon decoherence. While the consensus is that these effects are detrimental to collective excitation, our recent studies reveal a more complicated interplay. In this talk, I will discuss our recent efforts to account for these interplay in molecular ensembles and outline our plans to develop a theoretical framework for simulating collective excitations in materials.

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