Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911457440956416 |
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| author | Bastianello, Alvise Zeng, Yi Dhar, Sudipta Wang, Zekui Yu, Xudong Horvath, Milena Astrakharchik, Grigori E. Guo, Yanliang Nägerl, Hanns-Christoph Landini, Manuele |
| author_facet | Bastianello, Alvise Zeng, Yi Dhar, Sudipta Wang, Zekui Yu, Xudong Horvath, Milena Astrakharchik, Grigori E. Guo, Yanliang Nägerl, Hanns-Christoph Landini, Manuele |
| contents | Critical quantum field theories occupy a central position in modern theoretical physics for their inherent universality stemming from long-range correlations. As an example, the Tomonaga-Luttinger liquid (TLL) describes a wealth of one-dimensional quantum systems at low temperatures. Its behavior is deeply rooted in the emergence of an effective Fermi sea, leading to power-law correlations and Friedel oscillations. A promising direction to realize systems exhibiting novel universal behavior beyond TLL is through the generalization of the underlying Fermi sea. In this Letter, we show that fractional Fermi seas with reduced occupancy arise in an integrable Bose gas driven out of equilibrium by cyclic changes in interactions from repulsive to attractive. The correlation functions feature signatures of criticality incompatible with a conventional TLL, suggesting a novel critical phase. Our predictions, based on Generalized Hydrodynamics, are directly relevant to cold atoms. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_17656 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas Bastianello, Alvise Zeng, Yi Dhar, Sudipta Wang, Zekui Yu, Xudong Horvath, Milena Astrakharchik, Grigori E. Guo, Yanliang Nägerl, Hanns-Christoph Landini, Manuele Quantum Gases Statistical Mechanics Quantum Physics Critical quantum field theories occupy a central position in modern theoretical physics for their inherent universality stemming from long-range correlations. As an example, the Tomonaga-Luttinger liquid (TLL) describes a wealth of one-dimensional quantum systems at low temperatures. Its behavior is deeply rooted in the emergence of an effective Fermi sea, leading to power-law correlations and Friedel oscillations. A promising direction to realize systems exhibiting novel universal behavior beyond TLL is through the generalization of the underlying Fermi sea. In this Letter, we show that fractional Fermi seas with reduced occupancy arise in an integrable Bose gas driven out of equilibrium by cyclic changes in interactions from repulsive to attractive. The correlation functions feature signatures of criticality incompatible with a conventional TLL, suggesting a novel critical phase. Our predictions, based on Generalized Hydrodynamics, are directly relevant to cold atoms. |
| title | Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas |
| topic | Quantum Gases Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2602.17656 |