Chirality of superfluid 3He-A.
Chirality of superfluid 3He-A.
复制标题
超流体 3He-A 的手性。
DOI：
10.1103/physrevlett.109.215301
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
Walmsley PM
中科院分区：
文献类型：
--
作者：
Walmsley PM
我们使用包含超流体圆盘状板的扭转振荡器来探测在连续旋转时冷却到超流体状态所产生的手性轨道结构。将观察到的流驱动纹理转变与可能纹理的数值模拟进行比较表明，停止旋转后留下了与角速度 l^反平行的定向单域纹理。在涡旋状态下偏向特定的手性是由于相反循环的涡旋能量不相等。当从静止状态旋转起来时，涡旋成核的临界速度取决于相对于 l^ 的旋转方向。当角速度平行于 l^ 时，会出现一种不同类型的涡度，显然通过畴壁与板的边缘相连。
We have used torsional oscillators, containing disk-shaped slabs of superfluid-, to probe the chiral orbital textures created by cooling into the superfluid state while continuously rotating. Comparing the observed flow-driven textural transitions with numerical simulations of possible textures shows that an oriented monodomain texture with l^antiparallelto the angular velocityis left behind after stopping rotation. The bias toward a particular chirality, while in the vortex state, is due to the inequivalence of energies of vortices of opposite circulation. When spun-up from rest, the critical velocity for vortex nucleation depends on the sense of rotation relative to that of l^. A different type of vorticity, apparently linked to the slab’s rim by a domain wall, appears when the angular velocity,, is parallel to l^.