Contact and static structure factor for bosonic and fermionic mixtures

• Autor(a) principal: Barfknecht, Rafael Emilio
• Data de Publicação: 2015
• Outros Autores: Brouzos, Ioannis, Foerster, Angela
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/118050
• topic: Sistemas de bósons; Sistemas de férmions pesados

We study measurable quantities of bosonic and fermionic mixtures on a one-dimensional ring. These few-body ensembles consist of majority atoms obeying certain statistics (Fermi or Bose) and an impurity atom in a different hyperfine state. The repulsive interactions between majority-impurity and majority-majority are varied from weak to strong. We show that the majority-impurity repulsion is mainly responsible for the loss of coherence in the strongly interacting regime. The momentum distribution follows the C/p4 universal behavior for the high-momentum tail, but the contact C is strongly dependent on the strength of the majority-impurity and in a different way on the majority-majority interactions. The static structure factor of the majority atoms exposes a low-momentum peak for strong majority-impurity repulsion, which is attributed to an effective attraction not expected for purely repulsive forces.