Monte Carlo simulations of the unitary Bose gas
Anno: 2014
Autori: Rossi M., Salasnich L., Ancilotto F., Toigo F.
Affiliazione autori: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35122 Padua, Italy; Univ Padua, CNISM, I-35122 Padua, Italy; CNR, IOM, I-34136 Trieste, Italy
Abstract: We investigate the zero-temperature properties of a diluted homogeneous Bose gas made of N particles interacting via a two-body square-well potential by performing Monte Carlo simulations. We tune the interaction strength to achieve arbitrary positive values of the scattering length and compute by Monte Carlo quadrature the energy per particle E/N and the condensate fraction N-0/N of this system by using a Jastrow ansatz for the many-body wave function, which avoids the formation of the self-bound ground state and describes instead a (metastable) gaseous state with uniform density. In the unitarity limit, where the scattering length diverges while the range of the interatomic potential is much smaller than the average distance between atoms, we find a finite energy per particle [E/N=0.70 [sic](2)(6 pi(2)n)(2/3)/2m, with n the number density] and a quite large condensate fraction (N-0/N=0.83).
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 89 (4) Da Pagina: 041602 A: 041602
Maggiori informazioni: The authors thank D.E. Galli and G. Bertaina for useful discussions and suggestions. The authors acknowledge Universita di Padova (Grant No. CPDA118083), Cariparo Foundation (Eccellenza Grant No. 11/12), and MIUR (PRIN Grant No. 2010LLKJBX) for partial support.DOI: 10.1103/PhysRevA.89.041602Citazioni: 31dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
