Journal
PHYSICA SCRIPTA
Volume 96, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1402-4896/abcdc3
Keywords
quantum hydrodynamics; spin-1 Bose condensate; waves dynamics; spin waves; Berry phase
Categories
Funding
- Russian Science Foundation [19-72-00017]
- Russian Science Foundation [19-72-00017] Funding Source: Russian Science Foundation
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In this study, a novel model of magnetized spin-1 Bose-Einstein condensate is developed using the method of many-particle quantum hydrodynamic. The dynamics of fluid velocity and magnetization are determined by a nontrivial modification of the Euler and Landau-Lifshitz equations. The properties of dispersion spectrum of collective excitations are described, predicting an anisotropic spin wave instability.
We develop a novel model of the magnetized spin-1 Bose-Einstein condensate (BEC) of neutral atoms, using the method of many-particle quantum hydrodynamic (QHD) and propose an original derivation of the system of continual equations. We consider bosons with a spin-spin interaction and a short range interaction in the first order in the interaction radius, on the of basis of the self-consistent field approximation of the QHD equations. We demonstrate that the dynamics of the fluid velocity and magnetization is determined by a nontrivial modification of the Euler and Landau-Lifshitz equation, and show that a nontrivial modification of the spin density evolution equation contains the spin torque effect that arises from the self-interactions between spins of the bosons. The properties of the dispersion spectrum of collective excitations are described. We obtain the new contribution of the self-interaction of spins in the spin wave spectrum together with the influence of an external magnetic field and spin-spin interactions between polarized particles. The anisotropic spin wave instability is predicted.
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