Physics – Condensed Matter
Scientific paper
2002-10-10
Physics
Condensed Matter
7 pages, 9 figures
Scientific paper
10.1103/PhysRevA.67.013608
Motivated by the recent development of the Feshbach technique, we studied the ground and low-lying excited states of attractive Bose-Einstein condensates on a one-dimensional ring as a function of the strength of interactions. The Gross-Pitaevskii mean-field theory predicts a quantum phase transition between a uniform condensate and a bright soliton, and a gapless singular cusp in the Bogoliubov excitation spectrum at the critical point. However, the exact diagonalization reveals the presence of an energy gap at the critical point, where the singularity is smeared by quantum fluctuations.
Kanamoto Rina
Saito Hiroki
Ueda Masahito
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