Spiral renormalization group flow and universal entanglement spectrum of the non-Hermitian 5-state Potts model
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913178386956288 |
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| author | Linden, Vic Vander De Vos, Boris Vervoort, Kevin Verstraete, Frank Ueda, Atsushi |
| author_facet | Linden, Vic Vander De Vos, Boris Vervoort, Kevin Verstraete, Frank Ueda, Atsushi |
| contents | The quantum $5$-state Potts model is known to possess a perturbative description using complex conformal field theory (CCFT), the analytic continuation of ``theory space" to a complex plane. To study the corresponding complex fixed point on the lattice, the model must be deformed by an additional non-Hermitian term due to its complex coefficient $λ$. Although the variational principle breaks down in this case, we demonstrate that tensor network algorithms are still capable of simulating these non-Hermitian theories. We access system sizes up to $L = 28$, which enable the observation of the theoretically predicted spiral flow of the running couplings. Moreover, we reconstruct the full boundary CCFT spectrum through the entanglement Hamiltonian encoded in the ground state. Our work demonstrates how tensor networks are the correct approach to capturing the approximate conformal invariance of weakly first-order phase transitions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_14732 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spiral renormalization group flow and universal entanglement spectrum of the non-Hermitian 5-state Potts model Linden, Vic Vander De Vos, Boris Vervoort, Kevin Verstraete, Frank Ueda, Atsushi Strongly Correlated Electrons Quantum Physics The quantum $5$-state Potts model is known to possess a perturbative description using complex conformal field theory (CCFT), the analytic continuation of ``theory space" to a complex plane. To study the corresponding complex fixed point on the lattice, the model must be deformed by an additional non-Hermitian term due to its complex coefficient $λ$. Although the variational principle breaks down in this case, we demonstrate that tensor network algorithms are still capable of simulating these non-Hermitian theories. We access system sizes up to $L = 28$, which enable the observation of the theoretically predicted spiral flow of the running couplings. Moreover, we reconstruct the full boundary CCFT spectrum through the entanglement Hamiltonian encoded in the ground state. Our work demonstrates how tensor networks are the correct approach to capturing the approximate conformal invariance of weakly first-order phase transitions. |
| title | Spiral renormalization group flow and universal entanglement spectrum of the non-Hermitian 5-state Potts model |
| topic | Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2507.14732 |