论文标题
磁蛋白和镁束对的拓扑混合体
Topological Hybrids of Magnons and Magnon Bound Pairs
论文作者
论文摘要
我们考虑量子凝结物质系统，而没有粒子量的保护。由于粒子数不是一个良好的量子数，因此属于不同粒子扇区的状态可以杂交，这会导致光谱中的拓扑抗骨骼。所得的光谱间隙支持手性边缘激发，其波功能是两个杂交扇区中状态的叠加。这种情况以完全饱和的自旋 - 肛门性量子磁体而无需自旋保存实现，其中单镁与镁结合对杂交，即两麦克诺结合状态。所产生的手性边缘激发是外来的复合材料，它们具有混合的自旋多极性特征，分别从单一智能和两种稳定性中遗传了自旋 - 二色和自旋四极特征。与已建立的拓扑元音相反，这里讨论的拓扑效应是真正的量子机械起源，并且在经典极限中消失。我们讨论对固有异常的霍尔型传输和超越旋转计算范式的影响。我们得出的结论是，完全极化的量子磁铁是由粒子数扇区之间杂交引起的拓扑的有前途的平台，它补充了与保守数量颗粒的超速原子领域。
We consider quantum condensed matter systems without particle-number conservation. Since the particle number is not a good quantum number, states belonging to different particle-number sectors can hybridize, which causes topological anticrossings in the spectrum. The resulting spectral gaps support chiral edge excitations whose wavefunction is a superposition of states in the two hybridized sectors. This situation is realized in fully saturated spin-anisotropic quantum magnets without spin conservation, in which single magnons hybridize with magnon bound pairs, i.e., two-magnon bound states. The resulting chiral edge excitations are exotic composites that carry mixed spin-multipolar character, inheriting spin-dipolar and spin-quadrupolar character from their single-particleness and two-particleness, respectively. In contrast to established topological magnons, the topological effects discussed here are of genuine quantum mechanical origin and vanish in the classical limit. We discuss implications for both intrinsic anomalous Hall-type transport and beyond-spintronics computation paradigms. We conclude that fully polarized quantum magnets are a promising platform for topology caused by hybridizations between particle-number sectors, complementing the field of ultracold atoms working with a conserved number of particles.
