An operator-algebraic approach to analyze the yrast spectrum of weakly interacting bosons is proposed. The basic idea is to exploit the macroscopic occupation of a particular mode to rewrite the second-quantized interaction Hamiltonian under the restriction of the total particle-number conservation and the angular-momentum conservation. Analytically, it is shown that the lowest-lying excitation spectrum from the yrast line is given by 27gn3(n3-1)/34.
|Number of pages||7|
|Journal||Physical Review A. Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2001 Dec|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics