Work

Universal Composite Boson Formation in Strongly Interacting One-Dimensional Fermionic Systems

Year: 2024

Type: article

Abstract: Attractive p-wave one-dimensional fermions are studied in the fermionic Tonks-Girardeau regime in which the diagonal properties are shared with those of an ideal Bose gas. We study the off-diagonal properties and present analytical expressions for the eigenvalues of the one-body density matrix. One striking aspect is the universality of the occupation numbers which are independent of the specific shape of the external potential. We show that the occupation of natural orbitals occurs in pairs, indicating the formation of composite bosons, each consisting of two attractive fermions. The formation of composite bosons sheds light on the pairing mechanism of the system orbitals, yielding a total density equal to that of a Bose-Einstein condensate.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.132.193401

Authors: Francesc Sabater, Abel Rojo-Francàs, Grigori E. Astrakharchik, Bruno Juliá-Díaz

Institutions: Institut de Ciències del Cosmos, Universitat de Barcelona, Universitat Politècnica de Catalunya

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze