Physica Scripta

Singlet-triplets and excited triplets in trapped medium-body systems with particle number 3 ≤ N ≤ 13 and with spin-4 cold atoms

Y M Liu, Y. Z. He, Bao Cheng-guang

Published Dec 14, 2023• 0 citations

Abstract

Abstract The spin-textures of trapped medium-body cold systems of spin-4 atoms with the interaction dominated by the attractive λ = 4 channel (the two interacting spins are coupled to 4) have been studied via an exact diagonalization of the spin-dependent Hamiltonian under the single spatial mode approximation. Particle number N (3 ≤ N ≤ 13) is assumed. The eigenstates have been analyzed to find out the details of spin-structures and the inherent excitation modes, and the relation between all of them. The emphasis is to find out how the spectra depend on N. We found that the singlet-triplets (a 3-body subsystem where the three spins are coupled to zero) and various excited triplets are basic constituents and all the eigenstates are composed of them. For low-lying states, only a few particles are involved in the excitation modes, while the other particles would 3-by-3 keep themselves in singlet-triplets.

DOI: 10.1088/1402-4896/ad15cd

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