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Chinese Physics Letters

Quantum Effects of Many Atoms in Spinor Bose-Einstein Condensates

于肇贤, 梁九卿, 焦志勇

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

我们学习了在纺纱之间的人口转移，通道水流和反 bunching 效果的进化 --(+1 ) 并且纺纱 --( 在强壮的激光的情况中的 -1) 搏动。Itis 发现人口转移和通道水流展出期刊摆动。为一样的 Rabi 频率，越大原子数字，摆动时期是越多 longer。为 thespin-(-1) 部件当原子序数是 N = 时 4 和 10，反 bunching 效果能出现。为不同原子序数，出现区域是很不同的。为旋转部件 +1， theantibunching 效果能总是为不同原子序数出现。

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我们学习了在纺纱之间的人口转移，通道水流和反 bunching 效果的进化 --(+1 ) 并且纺纱 --( 在强壮的激光的情况中的 -1) 搏动。Itis 发现人口转移和通道水流展出期刊摆动。为一样的 Rabi 频率，越大原子数字，摆动时期是越多 longer。为 thespin-(-1) 部件当原子序数是 N = 时 4 和 10，反 bunching 效果能出现。为不同原子序数，出现区域是很不同的。为旋转部件 +1， theantibunching 效果能总是为不同原子序数出现。
We have studied the evolutions of the population transfer, tunnelling current and antibunching effects between spin-(+1) and spin-(-1) in the case of the strong laser pulses. It is found that the population transfer and tunnelling current exhibit periodical oscillation. For the same Rabi frequency, the larger the atom number, the longer the oscillation period is. For the spin-(-1) component, when the atomic numbers are N = 4 and 10, the antibunching effect can appear. For different atomic numbers, the appearing regions are very different. For spin component +1, the antibunching effect can always appear for different atomic numbers.
The recently realized multicomponent Bose-Einstein condensates provide opportunities to explore the rich physics brought about by the spin degrees of freedom. For instance, we can study spin waves and phase separation, macroscopic quantum tunneling, Rabi oscillations, the coupling between spin gradients and superfluid flow, squeezed spin states, vortices and other topological excitations. Theoretically, there have been already some studies of the ground-state properties of these systems and their line-like vortex excitations. In analogy with nuclear physics or the quantum Hall effect, we explore here the possibility of observing point-like topological excitations or skyrmions. These are nontrivial spin textures that in principle can exist in a spinor Bose-Einstein condensate. In particular, we investigate the stability of skyrmions in a fictitious spin-1/2 condensate of Rb87 atoms. We find that skyrmions can exist in this case only as a metastable state, but with a lifetime of the order of, or even longer than, the typical lifetime of the condensate itself. In addition to determining the size and the lifetime of the skyrmion, we also present its spin texture and finally briefly consider its dynamical properties.
在多维的光格子的 Bose 爱因斯坦冷凝物的高顺序的相互作用被讨论经分解并且数字地。健全速度和 Bloch 波浪的稳定性上的高顺序的原子相互作用的效果强烈取决于格子力量，这被表明。面对高顺序的效果，更紧密、高度维的格子被证实是为维持系统的精力充沛的稳定性的二个积极因素，并且 Bloch 的动态不稳定性飘动能与精力充沛的不稳定性同时发生。另外，我们发现高顺序的相互作用展出远程的行为，在一个倾斜的光格子的长寿协调 Bloch 摆动存在。我们的结果提供一个有效方法在光格子探查高顺序的相互作用。