SU(2) gauge theory of fluctuating stripe order in the two-dimensional Hubbard model
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909020990734336 |
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| author | Müller-Groeling, Henrik Bonetti, Pietro M. Forni, Paulo Metzner, Walter |
| author_facet | Müller-Groeling, Henrik Bonetti, Pietro M. Forni, Paulo Metzner, Walter |
| contents | We present an SU(2) gauge theory of fluctuating stripe order in the two-dimensional Hubbard model. The theory is based on a fractionalization of the electron operators in fermionic chargons with a pseudospin degree of freedom, and charge neutral spinons capturing fluctuations of the spin orientation. The chargons are treated in a renormalized mean-field theory. We focus on regions of the phase diagram where they undergo stripe order. The spinons are described by a non-linear sigma model with pseudospin stiffnesses determined by the chargons. They prevent breaking of the physical SU(2) spin symmetry at any finite temperature, resulting in a charge ordered pseudogap phase with a reconstructed Fermi surface and a spin gap. The spectral function for single-particle excitations exhibits a collection of Fermi arcs and other structures. The arcs appear in various regions of the Brillouin zone, but never exclusively around the Brillouin zone diagonals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_13071 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | SU(2) gauge theory of fluctuating stripe order in the two-dimensional Hubbard model Müller-Groeling, Henrik Bonetti, Pietro M. Forni, Paulo Metzner, Walter Strongly Correlated Electrons We present an SU(2) gauge theory of fluctuating stripe order in the two-dimensional Hubbard model. The theory is based on a fractionalization of the electron operators in fermionic chargons with a pseudospin degree of freedom, and charge neutral spinons capturing fluctuations of the spin orientation. The chargons are treated in a renormalized mean-field theory. We focus on regions of the phase diagram where they undergo stripe order. The spinons are described by a non-linear sigma model with pseudospin stiffnesses determined by the chargons. They prevent breaking of the physical SU(2) spin symmetry at any finite temperature, resulting in a charge ordered pseudogap phase with a reconstructed Fermi surface and a spin gap. The spectral function for single-particle excitations exhibits a collection of Fermi arcs and other structures. The arcs appear in various regions of the Brillouin zone, but never exclusively around the Brillouin zone diagonals. |
| title | SU(2) gauge theory of fluctuating stripe order in the two-dimensional Hubbard model |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.13071 |