Low-Lying Excitations from the Yrast Line of Weakly Interacting Trapped Bosons
Abstract
Through an extensive numerical study, we find that the low-lying, quasi-degenerate eigenenergies of weakly-interacting trapped N bosons with total angular momentum L are given in case of small L/N and sufficiently small L by E = L hbar omega + g[N(N-L/2-1)+1.59 n(n-1)/2], where omega is the frequency of the trapping potential and g is the strength of the repulsive contact interaction; the last term arises from the pairwise repulsive interaction among n octupole excitations and describes the lowest-lying excitation spectra from the Yrast line. In this case, the quadrupole modes do not interact with themselves and, together with the octupole modes, exhaust the low-lying spectra which are separated from others by N-linear energy gaps.
Cite
@article{arxiv.cond-mat/0007004,
title = {Low-Lying Excitations from the Yrast Line of Weakly Interacting Trapped Bosons},
author = {Tatsuya Nakajima and Masahito Ueda},
journal= {arXiv preprint arXiv:cond-mat/0007004},
year = {2009}
}
Comments
5 pages, RevTeX, 2 figures, revised version, submitted to PRA