Exceptional points and spectral cusps from density-wave fluctuation
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911289645727744 |
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| author | Fang, Zixi Fang, Chen |
| author_facet | Fang, Zixi Fang, Chen |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_21825 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exceptional points and spectral cusps from density-wave fluctuation Fang, Zixi Fang, Chen Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics 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. |
| title | Exceptional points and spectral cusps from density-wave fluctuation |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2511.21825 |