Properties of Bose-Einstein condensates with altermagnetism
- URL: http://arxiv.org/abs/2602.10362v2
- Date: Thu, 12 Feb 2026 05:12:35 GMT
- Title: Properties of Bose-Einstein condensates with altermagnetism
- Authors: Jia Wang, Zhao Liu, Xia-Ji Liu, Hui Hu,
- Abstract summary: We investigate a weakly interacting two-component Bose-Einstein condensate in the miscible regime.<n>We derive the quasiparticle spectrum and coherence factors and show that altermagnetic order generically induces an angular dependence of the low-energy excitations.<n>Our results should be testable with ultracold-atom experiments in the foreseeable future.
- Score: 10.960897002296148
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We investigate a weakly interacting two-component Bose--Einstein condensate in the miscible regime in the presence of \emph{altermagnetism}, i.e., a collinear and globally compensated magnetic order that breaks spin-rotation symmetry while maintaining zero net magnetization. Within Bogoliubov theory, we derive the quasiparticle spectrum and coherence factors and show that altermagnetic order generically induces an angular dependence of the low-energy excitations. As a result, the sound velocity, momentum-resolved magnetization in the quantum depletion, and density--spin response functions acquire anisotropic components. We show that these anisotropic contributions vanish after angular averaging, consistent with the defining feature of altermagnetism: nontrivial local spin polarization without a global magnetization. Finally, we evaluate the Lee--Huang--Yang correction to the ground-state energy in the altermagnetic phase. Our results should be testable with ultracold-atom experiments in the foreseeable future.
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