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Bose Einstein condensation and ferromagnetism of low density Bose gas of particles with arbitrary spin

Properties of the ground state and the spectrum of elementary excitations are investigated for the low density ultracold spinor 3D Bose gas of particles with arbitrary nonzero spin. Gross-Pitaevskii equations are derived. Within the framework of the considering interaction Hamiltonian it is shown that the ground state spin structure and spin part of the chemical potential is determined by the renormalized interaction, being defined by the contribution of the virtual large momenta. The ferromagnetic structure of the ground state, and the equation of the phase, density, and spin dynamics are obtained from Gross-Pitaevskii equations.

preprint2021arXivOpen access
V. S. BabichenkoI. Ya. Polishchuk
cond-mat.stat-mechcond-mat.quant-gas
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V. S. BabichenkoI. Ya. Polishchuk

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