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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2312.11333 |
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| _version_ | 1866912125460414464 |
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| author | Senese, Riccardo Robertson, Jacob H. Essler, Fabian H. L. |
| author_facet | Senese, Riccardo Robertson, Jacob H. Essler, Fabian H. L. |
| contents | We consider the probability distributions of the subsystem (staggered) magnetization in ordered and disordered models of quantum magnets in D dimensions. We focus on Heisenberg antiferromagnets and long-range transverse-field Ising models as particular examples. By employing a range of self-consistent time-dependent mean-field approximations in conjunction with Holstein-Primakoff, Dyson-Maleev, Schwinger boson and modified spin-wave theory representations we obtain results in thermal equilibrium as well as during non-equilibrium evolution after quantum quenches. To extract probability distributions we derive a simple formula for the characteristic function of generic quadratic observables in any Gaussian theory of bosons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_11333 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Out-of-equilibrium full counting statistics in Gaussian theories of quantum magnets Senese, Riccardo Robertson, Jacob H. Essler, Fabian H. L. Statistical Mechanics We consider the probability distributions of the subsystem (staggered) magnetization in ordered and disordered models of quantum magnets in D dimensions. We focus on Heisenberg antiferromagnets and long-range transverse-field Ising models as particular examples. By employing a range of self-consistent time-dependent mean-field approximations in conjunction with Holstein-Primakoff, Dyson-Maleev, Schwinger boson and modified spin-wave theory representations we obtain results in thermal equilibrium as well as during non-equilibrium evolution after quantum quenches. To extract probability distributions we derive a simple formula for the characteristic function of generic quadratic observables in any Gaussian theory of bosons. |
| title | Out-of-equilibrium full counting statistics in Gaussian theories of quantum magnets |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2312.11333 |