Takahashi M, Ghosh Sankalpa, Mizushima T, Machida K
Department of Physics, Okayama University, Okayama 700-8530, Japan.
Phys Rev Lett. 2007 Jun 29;98(26):260403. doi: 10.1103/PhysRevLett.98.260403. Epub 2007 Jun 25.
Bose-Einstein condensates which are dominated by magnetic dipole-dipole interaction are discussed under spinful situations. We treat the spin degrees of freedom as a classical spin vector, approaching from the large spin limit to obtain an effective minimal Hamiltonian. This is a version extended from a nonlinear sigma model. By solving the Gross-Pitaevskii equation, we find several novel spin textures where the mass density and spin density are strongly coupled, depending upon trap geometries due to the long-range and anisotropic natures of the dipole-dipole interaction.
在存在自旋的情况下，讨论了由磁偶极 - 偶极相互作用主导的玻色 - 爱因斯坦凝聚体。我们将自旋自由度视为经典自旋矢量，从大自旋极限开始推导以获得有效的最小哈密顿量。这是一个从非线性西格玛模型扩展而来的版本。通过求解格罗斯 - 皮塔耶夫斯基方程，我们发现了几种新颖的自旋纹理，其中质量密度和自旋密度强烈耦合，这取决于偶极 - 偶极相互作用的长程和各向异性性质所导致的陷阱几何形状。
