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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2604.13185 |
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| _version_ | 1866911594056777728 |
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| author | Peña, Francisco J. García-Zamora, Rafael De Chiara, Gabriele Flores, Jorge Henríquez, Santiago Barra, Felipe Vargas, Patricio |
| author_facet | Peña, Francisco J. García-Zamora, Rafael De Chiara, Gabriele Flores, Jorge Henríquez, Santiago Barra, Felipe Vargas, Patricio |
| contents | We demonstrate that flat-band engineering provides a direct route to control and optimize the thermodynamic performance of quantum heat engines. We consider noninteracting bosons on a rhombi-chain lattice described by a Bose-Hubbard model in the noninteracting limit, where a magnetic flux serves as a tunable parameter that continuously reshapes the single-particle spectrum. By driving the system toward the fully frustrated Aharonov-Bohm caging regime, the band structure transitions from dispersive to completely flat, strongly modifying the thermal occupation of the modes. We show that this flux-induced spectral restructuring has clear and measurable thermodynamic consequences. In particular, the Otto cycle exhibits a significant enhancement of both work output and efficiency when operating near the caging regime. We identify the underlying mechanism as a pronounced suppression of heat released to the cold reservoir, rather than an increase in absorbed heat, revealing that flat-band formation is an effective strategy to increase work extraction. In contrast, the Stirling cycle is governed by entropy variations along isothermal, flux-driven processes, leading to greater work extraction over a broader parameter range but at lower efficiency. These results establish geometric frustration and Aharonov-Bohm caging as thermodynamic resources and show that spectral engineering via synthetic gauge fields offers a viable, experimentally accessible pathway to tailor the performance of bosonic quantum thermal machines. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13185 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Bosonic Working Media in a Frustrated Rhombi Chain: Otto and Stirling Cycles from Flat Bands, Caging, and Flux Control Peña, Francisco J. García-Zamora, Rafael De Chiara, Gabriele Flores, Jorge Henríquez, Santiago Barra, Felipe Vargas, Patricio Quantum Gases Statistical Mechanics We demonstrate that flat-band engineering provides a direct route to control and optimize the thermodynamic performance of quantum heat engines. We consider noninteracting bosons on a rhombi-chain lattice described by a Bose-Hubbard model in the noninteracting limit, where a magnetic flux serves as a tunable parameter that continuously reshapes the single-particle spectrum. By driving the system toward the fully frustrated Aharonov-Bohm caging regime, the band structure transitions from dispersive to completely flat, strongly modifying the thermal occupation of the modes. We show that this flux-induced spectral restructuring has clear and measurable thermodynamic consequences. In particular, the Otto cycle exhibits a significant enhancement of both work output and efficiency when operating near the caging regime. We identify the underlying mechanism as a pronounced suppression of heat released to the cold reservoir, rather than an increase in absorbed heat, revealing that flat-band formation is an effective strategy to increase work extraction. In contrast, the Stirling cycle is governed by entropy variations along isothermal, flux-driven processes, leading to greater work extraction over a broader parameter range but at lower efficiency. These results establish geometric frustration and Aharonov-Bohm caging as thermodynamic resources and show that spectral engineering via synthetic gauge fields offers a viable, experimentally accessible pathway to tailor the performance of bosonic quantum thermal machines. |
| title | Bosonic Working Media in a Frustrated Rhombi Chain: Otto and Stirling Cycles from Flat Bands, Caging, and Flux Control |
| topic | Quantum Gases Statistical Mechanics |
| url | https://arxiv.org/abs/2604.13185 |