Beliaev Damping of a Spin-Orbit-Coupled Bose-Einstein Condensate
Beliaev Damping of a Spin-Orbit-Coupled Bose-Einstein Condensate
复制标题
自旋轨道耦合玻色-爱因斯坦凝聚态的贝利亚耶夫阻尼
DOI：
10.1103/physrevlett.121.180401
复制
发表时间：
2018
影响因子：
8.6
通讯作者：
Zhaoxin Liang
中科院分区：
文献类型：
--
作者：
Rukuan Wu;Zhaoxin Liang
Beliaev衰减提供了准粒子耗散的基本机制。以前的研究表明，二分量内部自由度对Beliaev阻尼器的影响不是微不足道的。在这里，我们提供了第一个例子，其中玻色气体的旋量性质可以通过自旋-轨道耦合的方式在Beliaev衰减中表现出来。我们发现了由自旋-轨道耦合引起的Beliaev衰减率的新特征；特别是，它显示出对自旋密度相互作用的明显依赖，并且在零动量和平面波之间相互作用修正的相界处发散。这代表了超平均场区的自旋-轨道耦合效应的一种表现，通过打破伽利略不变性，耦合了密度和自旋通道中的激发。我们进一步表明，通过测量自旋极化率来测量Beliaev阻尼率在实验上是可行的，这已经在自旋轨道耦合的玻色气体中实现了。
Beliaev damping provides a fundamental mechanism for dissipation of quasiparticles. Previous research has shown that the two-component internal degrees of freedom has no nontrivial effect on Beliaev damping. Here we provide the first example where the spinor nature of Bose gases can manifest itself in the Beliaev damping by way of spin-obit coupling. We identify novel features of the Beliaev decay rate due to spin-orbit coupling; in particular, it shows an explicit dependence on the spin-density interaction and diverges at the interaction-modified phase boundary between the zero-momentum and plane wave phases. This represents a manifestation of the effect of spin-orbit coupling in the beyond-mean-field regime, which by breaking Galilean invariance couples excitations in the density and spin channels. We further show that the measurement of the Beliaev damping rate is experimentally feasible through the measurement of spin polarizability susceptibility, which has been already achieved in spin-orbit-coupled Bose gases.