Limitation of the Lee-Huang-Yang interaction in forming a self-bound state in Bose-Einstein condensates

Autor(es)

Gautam, Sandeep ^[1] ; Adhikari, Sadhan K. ^[2]

Afiliação do(s) autor(es)

^[1] Indian Inst Technol Ropar, Dept Phys, Rupnagar 140001, Punjab - India

^[2] Univ Estadual Paulista UNESP, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANNALS OF PHYSICS; v. 409, OCT 2019.
• Citações Web of Science: 0

Resumo

The perturbative Lee-Huang-Yang (LHY) interaction proportional to n(3/2), where n is the density, creates an infinitely repulsive potential at the center of a Bose-Einstein condensate (BEC) with net attraction, which stops the collapse to form a self-bound state in a dipolar BEC and in a binary BEC. However, recent microscopic calculations of the non-perturbative beyond-meanfield (BMF) interaction indicate that the LHY interaction is valid only for very small values of gas parameter x. We show that a realistic non-perturbative BMF interaction can stop collapse and form a self-bound state only in a weakly attractive binary BEC with small x values (x less than or similar to 0.01), whereas the perturbative LHY interaction stops collapse for all attractions. We demonstrate these aspects using an analytic BMF interaction with appropriate weak-coupling LHY and strong coupling limits. (C) 2019 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica
• Beneficiário: Nathan Jacob Berkovits
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais