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Topological resolution of conical intersection seams and the coupled cluster bifurcation via mixed Hodge modules
arXiv
Authors: Prasoon Saurabh
Year
2025
Paper ID
36317
Status
Preprint
Abstract Read
~2 min
Abstract Words
231
Citations
N/A
Abstract
The rigorous description of Conical Intersections (CIs) remains the central challenge of non-adiabatic quantum chemistry. While the "Yarkony Seam" - the (3N-8)-dimensional manifold of degeneracy - is well-understood geometrically, its accurate characterization by high-level electronic structure methods is plagued by numerical instabilities. Specifically, standard Coupled Cluster (CC) theory suffers from root bifurcations near Ground State CIs, rendering the "Gold Standard" of chemistry inapplicable where it is needed most. Here, we present QuMorpheus, an open-source computational package that resolves these singularities by implementing a topological framework based on Dissipative Mixed Hodge Modules (DMHM) [P. Saurabh, arXiv:2512.19487 (2025)]. By algorithmically mapping the CC polynomial equations to a spectral sheaf, we compute the exact Monodromy (μ) invariants of the intersection. We demonstrate that this automated algebraic geometry approach correctly identifies the physical ground state topology in the Köhn-Tajti model and resolves the intersection seams of realistic chemical systems, including Ethylene and the Chloronium ion $H2Cl^+$. Furthermore, we apply QuMorpheus to the photoisomerization of Previtamin D, proving that the experimentally observed Woodward-Hoffmann selection rules are a direct consequence of a topological "Monodromy Wall" $μ=1, γ=π$ rather than purely energetic barriers. This establishes a general software solution to the "Yarkony Problem," enabling the robust, automated mapping of global intersection seams in complex molecular systems. The topological stability of these intersections allows for the control protocols discussed in Ref.[P. Saurabh, Submitted to Phys. Rev. X (2025)].
Why This Paper Matters
- This paper contributes to the Quantum Chemistry research area in the Quantum Articles archive.
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- The rigorous description of Conical Intersections (CIs) remains the central challenge of non-adiabatic quantum chemistry.
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