Phase transitions and thermodynamic cycles in the broken PT-regime
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866910565228609536 |
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| author | Fring, Andreas Reboiro, Marta |
| author_facet | Fring, Andreas Reboiro, Marta |
| contents | We propose a new type of quantum thermodynamic cycle whose efficiency is greater than the one of the classical Carnot cycle for the same conditions for a system when viewed as homogeneous. In our model this type of cycle only exists in the low temperature regime in the spontaneously broken parity-time-reversal (PT) symmetry regime of a non-Hermitian quantum theory and does not manifest in the PT-symmetric regime. We discuss this effect for an ensemble based on a model of a single boson coupled in a non-Hermitian way to a bath of different types of bosons with and without a time-dependent boundary. The cycle can not be set up when considering our system as heterogeneous, i.e. undergoing a first order phase transition. Within that interpretation we find that the entropy is vanishing throughout the spontaneously broken PT-regime. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_06176 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Phase transitions and thermodynamic cycles in the broken PT-regime Fring, Andreas Reboiro, Marta Quantum Physics Mathematical Physics We propose a new type of quantum thermodynamic cycle whose efficiency is greater than the one of the classical Carnot cycle for the same conditions for a system when viewed as homogeneous. In our model this type of cycle only exists in the low temperature regime in the spontaneously broken parity-time-reversal (PT) symmetry regime of a non-Hermitian quantum theory and does not manifest in the PT-symmetric regime. We discuss this effect for an ensemble based on a model of a single boson coupled in a non-Hermitian way to a bath of different types of bosons with and without a time-dependent boundary. The cycle can not be set up when considering our system as heterogeneous, i.e. undergoing a first order phase transition. Within that interpretation we find that the entropy is vanishing throughout the spontaneously broken PT-regime. |
| title | Phase transitions and thermodynamic cycles in the broken PT-regime |
| topic | Quantum Physics Mathematical Physics |
| url | https://arxiv.org/abs/2308.06176 |