论文标题
固体中声音和伪声音声子的有效野外理论
Effective Field Theory for Acoustic and Pseudo-Acoustic Phonons in Solids
论文作者
论文摘要
我们提出了一个相对论的有效田间理论，用于在小间隙的极限下声音和盖帽的声子之间的相互作用。我们表明，虽然前者是与时空对称性自发断裂相关的金石模式，但后者是与某些（小）显式破裂相关的伪金石。因此，我们将他们配音为“伪声音”的声子。在第一次研究中，我们针对一个和两个空间维度，两个原子物种并假设距离较大的各向同性的情况建立了我们的有效理论。作为一个说明性的例子，我们说明了如何应用理论来计算声学和伪声音声子的总寿命。该结构可以找到从双层石墨烯的物理学到亚GEV暗物质探测器的应用。
We present a relativistic effective field theory for the interaction between acoustic and gapped phonons in the limit of a small gap. We show that, while the former are the Goldstone modes associated with the spontaneous breaking of spacetime symmetries, the latter are pseudo-Goldstones associated with some (small) explicit breaking. We hence dub them "pseudo-acoustic" phonons. In this first investigation, we build our effective theory for the cases of one and two spatial dimensions, two atomic species, and assuming large distance isotropy. As an illustrative example, we show how the theory can be applied to compute the total lifetime of both acoustic and pseudo-acoustic phonons. This construction can find applications that range from the physics of bilayer graphene to sub-GeV dark matter detectors.
