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| Autori principali: | , |
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| Natura: | Preprint |
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2021
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| Accesso online: | https://arxiv.org/abs/2110.13524 |
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| _version_ | 1866910311624212480 |
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| author | Correale, Lorenzo Silva, Alessandro |
| author_facet | Correale, Lorenzo Silva, Alessandro |
| contents | We study the non-equilibrium phase diagram of a fully-connected Ising $p$-spin model, for generic $p>2$, and investigate its robustness with respect to the inclusion of spin-wave fluctuations, resulting from a ferromagnetic, short-range spin interaction. In particular, we investigate the dynamics of the mean-field model after a quantum quench: we observe a new dynamical phase transition which is either first or second order depending on the even or odd parity of $p$, in stark contrast with its thermal counterpart which is first order for all $p$. The dynamical phase diagram is qualitatively modified by the fluctuations introduced by a short-range interaction which drive the system always towards various paramagnetic phases determined by the strength of time dependent fluctuations of the magnetization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2110_13524 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Changing the order of a dynamical phase transition through fluctuations in a quantum p-spin model Correale, Lorenzo Silva, Alessandro Statistical Mechanics We study the non-equilibrium phase diagram of a fully-connected Ising $p$-spin model, for generic $p>2$, and investigate its robustness with respect to the inclusion of spin-wave fluctuations, resulting from a ferromagnetic, short-range spin interaction. In particular, we investigate the dynamics of the mean-field model after a quantum quench: we observe a new dynamical phase transition which is either first or second order depending on the even or odd parity of $p$, in stark contrast with its thermal counterpart which is first order for all $p$. The dynamical phase diagram is qualitatively modified by the fluctuations introduced by a short-range interaction which drive the system always towards various paramagnetic phases determined by the strength of time dependent fluctuations of the magnetization. |
| title | Changing the order of a dynamical phase transition through fluctuations in a quantum p-spin model |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2110.13524 |