In an exactly solvable two-band model, phonons kill ground-state-exciton coherence but preserve a coherence between incoherent excitons, producing quantum beats in TR-ARPES that persist indefinitely.
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Long-Lived Coherence between Incoherent Excitons revealed by Time-Resolved ARPES: An Exact Solution
In an exactly solvable two-band model, phonons kill ground-state-exciton coherence but preserve a coherence between incoherent excitons, producing quantum beats in TR-ARPES that persist indefinitely.