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Quantum Chemistry Open Quantum Systems Decoherence

Exceptional points and spectral cusps from density-wave fluctuation

arXiv

Authors: Zixi Fang, Chen Fang

Year

2025

Paper ID

16595

Status

Preprint

Abstract Read

~2 min

Abstract Words

103

Citations

N/A

Abstract

We report two types of singularities that arise from fluctuations during the formation of charge- or spin-density waves. The first is the exceptional point (EP), corresponding to a higher-order pole of the retarded Green's function. Such EPs lead to algebraic corrections in the decay of quasiparticle occupations and are observable through time-resolved angle-resolved photoemission spectroscopy (Tr-ARPES). The second is a spectral cusp, defined by the coalescence of three extrema in the real-frequency spectral function A\(mathbf{k}, ω\). This cusp enforces the formation of Fermi arcs and induces a "threading" structure in the nearby band structure, both of which are directly observable in ARPES.

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We report two types of singularities that arise from fluctuations during the formation of charge- or spin-density waves.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2511.21825 [2] arXiv https://arxiv.org/abs/2511.21825 [3] Publisher https://arxiv.org/abs/2511.21825

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