Quantum Spin Glass in the Two-Dimensional Disordered Heisenberg Model via Foundation Neural-Network Quantum States
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914423586684928 |
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| author | Viteritti, Luciano Loris Rende, Riccardo Bracci-Testasecca, Giacomo Niedda, Jacopo Moessner, Roderich Carleo, Giuseppe Scardicchio, Antonello |
| author_facet | Viteritti, Luciano Loris Rende, Riccardo Bracci-Testasecca, Giacomo Niedda, Jacopo Moessner, Roderich Carleo, Giuseppe Scardicchio, Antonello |
| contents | We investigate the two-dimensional frustrated quantum Heisenberg model with bond disorder on nearest-neighbor couplings using the recently introduced Foundation Neural-Network Quantum States framework, which enables accurate and efficient computation of disorder-averaged observables with a single variational optimization. Simulations on large lattices reveal an extended region of the phase diagram where long-range magnetic order vanishes in the thermodynamic limit, while the overlap order parameter, which characterizes quantum spin glass states, remains finite. These findings, supported by a semiclassical analysis based on a large-spin expansion, provide compelling evidence that the spin glass phase is stable against quantum fluctuations, unlike the classical case where it disappears at any finite temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_05073 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Spin Glass in the Two-Dimensional Disordered Heisenberg Model via Foundation Neural-Network Quantum States Viteritti, Luciano Loris Rende, Riccardo Bracci-Testasecca, Giacomo Niedda, Jacopo Moessner, Roderich Carleo, Giuseppe Scardicchio, Antonello Disordered Systems and Neural Networks Strongly Correlated Electrons Quantum Physics We investigate the two-dimensional frustrated quantum Heisenberg model with bond disorder on nearest-neighbor couplings using the recently introduced Foundation Neural-Network Quantum States framework, which enables accurate and efficient computation of disorder-averaged observables with a single variational optimization. Simulations on large lattices reveal an extended region of the phase diagram where long-range magnetic order vanishes in the thermodynamic limit, while the overlap order parameter, which characterizes quantum spin glass states, remains finite. These findings, supported by a semiclassical analysis based on a large-spin expansion, provide compelling evidence that the spin glass phase is stable against quantum fluctuations, unlike the classical case where it disappears at any finite temperature. |
| title | Quantum Spin Glass in the Two-Dimensional Disordered Heisenberg Model via Foundation Neural-Network Quantum States |
| topic | Disordered Systems and Neural Networks Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2507.05073 |