Kubo-Martin-Schwinger-Gated Imaginary-Time Reconstruction of Time-Resolved Electronic Circular Dichroism in Organic Excitonic Aggregates

[2603.29850] Kubo-Martin-Schwinger-Gated Imaginary-Time Reconstruction of Time-Resolved Electronic Circular Dichroism in Organic Excitonic Aggregates Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Other Condensed Matter arXiv:2603.29850 (cond-mat) [Submitted on 31 Mar 2026 ( v1 ), last revised 15 Aug 2026 (this version, v4)] Title: Kubo-Martin-Schwinger-Gated Imaginary-Time Reconstruction of Time-Resolved Electronic Circular Dichroism in Organic Excitonic Aggregates Authors: Christian Tantardini , Caterina Cocchi View a PDF of the paper titled Kubo-Martin-Schwinger-Gated Imaginary-Time Reconstruction of Time-Resolved Electronic Circular Dichroism in Organic Excitonic Aggregates, by Christian Tantardini and Caterina Cocchi View PDF HTML (experimental) Abstract: Time-resolved electronic circular dichroism (TR-ECD) and time-resolved circular dichroism (TRCD) probe chiral exciton dynamics prepared by an ultrafast pump and interrogated by a weak circular probe. The measured signal is a causal mixed electric--magnetic response, whereas imaginary-time methods require a sufficiently stationary reference. Here, we introduce a Kubo--Martin--Schwinger-gated criterion that determines, at each pump--probe delay, whether the selected TRCD-like response can be represented by a conditional one-exciton Gibbs ensemble or requires explicit real-time or Keldysh dynamics. The diagnostic combines a state-level distance from the conditional reference with an integrated spectral distance for the reciprocal E1--M1 response. We apply the protocol to three literature-constrained Frenkel-exciton models: a Ress-type squaraine-polymer squeezed helix, a cisoid indolenine squaraine B hexamer, and a helical perylene-bisimide stack. The results show that early nonthermal states are non-admissible, whereas intramanifold population relaxation and the decay of coherence memory can open a Matsubara-admissible delay window before complete excited-state recovery. The resulting gate identifies when imaginary-time methods can be used without imposing a stationary description on a genuinely nonequilibrium chiroptical response. Subjects: Other Condensed Matter (cond-mat.other) Cite as: arXiv:2603.29850 [cond-mat.other] (or arXiv:2603.29850v4 [cond-mat.other] for this version) https://doi.org/10.48550/arXiv.2603.29850 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Christian Tantardini Prof. Dr. [ view email ] [v1] Tue, 31 Mar 2026 15:10:18 UTC (141 KB) [v2] Mon, 18 May 2026 14:05:36 UTC (5,567 KB) [v3] Wed, 8 Jul 2026 13:41:49 UTC (5,570 KB) [v4] Sat, 15 Aug 2026 06:25:25 UTC (4,281 KB) Full-text links: Access Paper: View a PDF of the paper titled Kubo-Martin-Schwinger-Gated Imaginary-Time Reconstruction of Time-Resolved Electronic Circular Dichroism in Organic Excitonic Aggregates, by Christian Tantardini and Caterina Cocchi View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.other < prev | next > new | recent | 2026-03 Change to browse by: cond-mat References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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