Emergence of magnetic excitations in one-dimensional quantum mixtures under confinement
Year: 2026
Type: article
Abstract: We obtain an exact solution for the spectral function for one-dimensional Bose-Bose and Fermi-Fermi mixtures with strong repulsive interactions, valid in arbitrary confining potentials and at all frequency scales. For the case of harmonic confinement, we show that, on top of the ladder structure of the density excitations imposed by the external confinement, spin excitations emerge as sideband peaks, with dispersion related to the one of ferromagnetic or antiferromagnetic spin chains and a width fundamentally larger for fermionic mixtures than for bosonic ones, as determined by the different symmetry of spin-excited states. The observation of spin excitation branches can provide a univocal probe of interaction-induced magnetism in ultracold atoms.
Source: Physical Review Research
DOI: 10.1103/w68q-n78h
Authors: P. Capuzzi, P. Vignolo, A. Minguzzi, S. Musolino
Institutions: Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Instituto de Física de Buenos Aires, Centre National de la Recherche Scientifique, Institut Universitaire de France, Université Côte d'Azur, Institut de Physique de Nice, Communauté d'universités et d'établissements Université Côte d'Azur, Laboratoire de Physique et Modélisation des Milieux Condensés, Université Grenoble Alpes
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
OpenAlex ID: W7127563946