Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas

• URL: http://arxiv.org/abs/2602.17656v1
• Date: Thu, 19 Feb 2026 18:58:52 GMT
• Title: Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas
• Authors: Alvise Bastianello, Yi Zeng, Sudipta Dhar, Zekui Wang, Xudong Yu, Milena Horvath, Grigori E. Astrakharchik, Yanliang Guo, Hanns-Christoph Nägerl, Manuele Landini,
• Abstract summary: 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.<n>Our predictions, based on Generalized Hydrodynamics, are directly relevant to cold atoms.
• Score: 4.586211620541124
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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