论文标题
Dirac Magnons的Bose-Einstein冷凝物：抽水和集体模式
Bose-Einstein condensate of Dirac magnons: Pumping and collective modes
论文作者
论文摘要
我们探索了狄拉克少镁（Dirac Bec）的Bose-Einstein冷凝物的形成和集体模式。虽然我们专注于二维Dirac木元素，但使用的方法是一般的，可用于描述各种系统中用线性准粒子光谱的Bose-Einstein冷凝物。通过使用泵玻色子种群的现象学多组分模型以及驻留于狄拉克节点的玻色子，研究了狄拉克玻色子的冷凝水的形成和时间演变。冷凝物相干性及其多组分性质在狂犬病振荡中表现出来，其周期由自旋波频谱中的间隙确定。集体模式的范围也可以探测冷凝物的狄拉克性质。结果表明，Haldane GAP提供了一种有效的手段，可以在间隙和无间隙集体模式之间调整并控制其稳定性。
We explore the formation and collective modes of Bose-Einstein condensate of Dirac magnons (Dirac BEC). While we focus on two-dimensional Dirac magnons, an employed approach is general and could be used to describe Bose-Einstein condensates with linear quasiparticle spectrum in various systems. By using a phenomenological multicomponent model of pumped boson population together with bosons residing at Dirac nodes, the formation and time evolution of condensates of Dirac bosons is investigated. The condensate coherence and its multicomponent nature are manifested in the Rabi oscillations whose period is determined by the gap in the spin-wave spectrum. A Dirac nature of the condensates could be also probed by the spectrum of collective modes. It is shown that the Haldane gap provides an efficient means to tune between the gapped and gapless collective modes as well as controls their stability.
