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Updated: Aug 5, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Unified First-Principles Formula for Time-Resolved ARPES Spectra of Coherent and Incoherent Excitons beyond the
Gianluca Stefanucci1, Enrico Perfetto1
1INFN, Sezione di Roma Tor Vergata, Università di Roma Tor Vergata, Dipartimento di Fisica, Via della Ricerca Scientifica 1, 00133 Rome, Italy and , Via della Ricerca Scientifica 1, 00133 Rome, Italy.
Abstract:
Despite major experimental progresses in time-resolved and angle-resolved photoemission spectroscopy, a quantitative, microscopic framework for interpreting exciton-induced modifications of electronic band structures-applicable even beyond the low-density limit-is still lacking. Here, we close this gap by introducing a unified approach that links the dynamics of coherent and incoherent excitons to distinct and experimentally observable excitonic sidebands. Our central result is a general, first-principles formula for time-resolved photoemission spectra, applicable across a broad range of temperatures, excitation densities, and pump-probe delays. This advance provides a predictive tool for quantitatively tracking excitonic dynamics in complex materials.
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