On Larkin-imry-ma State of He-a in Aerogel
On Larkin-imry-ma State of He-a in Aerogel
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气凝胶中 He-a 的 Larkin-imry-ma 状态
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通讯作者：
G. E. Volovik
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作者：
G. E. Volovik
超流体 3 He-A 具有自旋向列和手性轨道铁磁体的共同特性。其阶次参数由两个向量ˆd 和? 表征。这种双各向异性超流体当被限制在气凝胶中时，代表了在随机各向异性无序存在的情况下具有连续对称性的系统的最有趣的例子。我们讨论了 Larkin-Imry-Ma 态，其特征是矢量的短程取向顺序，而长程取向顺序则被随机取向的气凝胶弦的集体作用破坏。另一方面，气凝胶变形或施加的超流产生的足够大的规则各向异性破坏了拉金-伊姆里-马效应，导致了均匀取向。规则和随机各向异性的相互作用使我们能够研究许多不同的效应。
Superfluid 3 He-A shares the properties of spin nematic and chiral or-bital ferromagnet. Its order parameter is characterized by two vectorsˆd andî. This doubly anisotropic superfluid, when it is confined in aerogel, represents the most interesting example of a system with continuous symmetry in the presence of random anisotropy disorder. We discuss the Larkin-Imry-Ma state, which is characterized by the short-range orientational order of the vectorî, while the long-range orientational order is destroyed by the collective action of the randomly oriented aerogel strings. On the other hand, sufficiently large regular anisotropy produced either by the deformation of the aerogel or by applied superflow destroys the Larkin-Imry-Ma effect leading to the uniform orientation ofî. The interplay of regular and random anisotropy allows us to study many different effects.