论文标题
激子的反元素
Antiparticle of exciton in semimetals
论文作者
论文摘要
新兴的量化场富集量子多体系统。我们提出了一种在半学分中的激子的反颗粒类似物，作为相互作用的电子系统中的新兴集体模式。我们表明，半学中的带间激发通常由激子和反激子组成。这两个代表了半学以不同的带间集体模式，具有不同的能量和相反的保守电荷。这里保守的电荷是与与带间激发相关的两个电子带的关节u（1）对称性的数量共轭物。相反的费用促进了乐队间集体模式之间的肥沃散射过程。在自旋极化系统中，它们还提出了对抗粒子的可能实验检测。我们澄清说，相互激励的有效理论是由广义的克莱恩 - 戈登理论给出的。我们的理论提供了对通用半学中激发光谱的全面理解，从而对固体中的电子集体现象有了新的见解。
An emergent quantized field enriches quantum many-body systems. We propose an antiparticle analog of the exciton in semimetals as an emergent collective mode in interacting electron systems. We show that inter-band excitations in semimetals are generally comprised of both excitons and antiparticles of excitons. These two stand for two distinct inter-band collective modes in semimetals, having different energies and opposite conserved charges. The conserved charge here is a quantity conjugate to a joint U(1) symmetry of two electron's bands associated with the inter-band excitations. The opposite charges foster fertile scattering processes among the inter-band collective modes. In spin-polarized systems, they also suggest possible experimental detections of the antiparticles. We clarify that the effective theory of the inter-band excitations is given by a generalized Klein-Gordon theory. Our theory provides a comprehensive understanding of excitonic spectra in generic semimetals, bringing a new insight into electronic collective phenomena in solids.
