AI 中文总结
研究双外尔半金属中声衰减机制，发现因不存在轴向耦合，费米面形变几何结构成声衰减唯一来源，确定了简单外尔半金属所没有的声衰减几何贡献。
AI 中文摘要
简单外尔半金属中应变与节点的轴向耦合会对这类材料的声衰减产生反常贡献。然而，在双外尔半金属中不存在这种轴向耦合。应变作为一个破缺对称性的指向场耦合，使每个外尔节点周围的费米面发生形变。我们的研究表明，双外尔半金属中轴向耦合的缺失意味着一种截然不同的声弛豫机制。在这种情况下，费米面的形变几何结构是声衰减的唯一来源。因此，我们确定了双外尔半金属中存在一种简单外尔半金属完全不存在的声衰减几何贡献。
英文摘要
The axial coupling of strain to the nodes of the simple Weyl semimetals leads to anomalous contributions to sound attenuation in such materials. However, in double Weyl semimetals, there is no such axial coupling. Strain instead couples as a symmetry-breaking director field that deforms the Fermi surface around each Weyl node. In this work, we show that absence of axial coupling in double Weyl semimetals implies a very different mechanism of relaxation due to sound. The deformed geometry of the Fermi surface is the only source of sound attenuation under these conditions. Thus, we identify a geometric contribution to sound attenuation in double Weyl semimetals that is entirely absent in simple Weyl semimetals.
Comments11 pages (6 main text + 2 appendices), 1 figure
