Transverse waves in superfluid3He-B
Transverse waves in superfluid3He-B
复制标题
超流体中的横波3He-B
DOI：
10.1007/bf00132087
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发表时间：
1993
影响因子：
2
通讯作者：
J. Sauls
中科院分区：
文献类型：
--
作者：
G. Moores;J. Sauls
研究了体超流体3he - b中无碰撞横电流波的理论，包括其与序参量集体模的耦合。在低频，Ω≪δ(T)，阶参量模态对横向电流的恢复力没有贡献，准粒子的贡献随着频谱间隙的增大而迅速下降。因此，在温度接近tc时，低频横向声变得过阻尼。然而，在低温（T > 0.3Tc）下，与J = 2−,M = +-1模式的非谐振耦合稳定了横向电流模式的传播，在临界频率（约为J = 2−模式的临界频率）以上具有大的相速度和低阻尼。我们还讨论了超流体中纵向声和横向声的异同。例如，在零场中，左右圆极化波是简并的。含有$$\overrightarrow \operatorname{H}||\overrightarrow {\text{q}}$$的磁场提升了这种简并性，产生了类似于电磁波的圆二色性和双折射。因此，横波在b相中比在正常he中更容易被检测到。
We examine the theory of collisionless transverse current waves in bulk superfluid3He-B, including the coupling to the order parameter collective modes. At low frequencies, Ω ≪ δ(T), the order parameter modes do not contribute to the restoring force for a transverse current, and the quasiparticle contribution drops rapidly as the gap in the spectrum develops. Thus, low-frequency transverse sound becomes overdamped at temperatures nearTc. However, at low temperatures (T≲0.3Tc) the off-resonant coupling to the J = 2−,M = +-1modes stabilizes a propagating transverse current mode, with a large phase velocity and low damping for frequencies above a critical frequency that is approximately that of theJ = 2−mode. We also discuss the similarities and differences of longitudinal and transverse sound in the superfluid phases. For example, in zero field, right- and left-circularly polarized waves are degenerate. A magnetic field, with $$\overrightarrow \operatorname{H}||\overrightarrow {\text{q}}$$ , lifts this degeneracy, giving rise to the analog of circular dichroism and birefringence of electromagnetic waves. Thus, transverse waves may be more easily detected in the B-phase than in normal3He.