Particle creation in the spin modes of a dynamically oscillating two-component Bose-Einstein condensate
Particle creation in the spin modes of a dynamically oscillating two-component Bose-Einstein condensate
复制标题
动态振荡二组分玻色-爱因斯坦凝聚态自旋模式下的粒子产生
DOI：
10.1103/physrevd.104.083503
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发表时间：
2021
影响因子：
5
通讯作者：
I. Carusotto
中科院分区：
文献类型：
--
作者：
S. Butera;I. Carusotto
我们研究了由凝聚密度的动力学演化触发的两组分玻色-爱因斯坦凝聚体自旋模零点涨落的参量放大。首先，我们利用一个Escheras-Fermi近似开发一个易于处理的理论模型的Bogoliubov激发的量子动力学的谐波捕获凝聚与时间相关的捕获频率。这个模型的预测，然后进行比较，从头计算的密度和自旋波动的相关函数的一般空间非均匀配置的数值研究。结果示出的两种情况下的膨胀和振荡的凝聚体：而自旋模式的量子激发仍然很弱，在膨胀凝聚体的情况下，相对无特色的，明确的和实验上有前途的签名粒子创建预期的振荡的情况下，在适当的共振条件下的密度和自旋模式。
We investigate the parametric amplification of the zero-point fluctuations in the spin modes of a two-component Bose-Einstein condensate, triggered by the dynamical evolution of the condensate density. We first make use of a Thomas-Fermi approximation to develop a tractable theoretical model of the quantum dynamics of the Bogoliubov excitations in a harmonically trapped condensate with a time-dependent trapping frequency. The predictions of this model are then compared to an ab-initio numerical study of the correlation functions of density and spin fluctuations for general spatially inhomogeneous configurations. Results are shown for the two cases of expanding and oscillating condensates: while the quantum excitation of spin modes remains weak and relatively featureless in the case of an expanding condensate, clear and experimentally promising signatures of particle creation are anticipated for the oscillating case under suitable resonance conditions between the density and the spin modes.
影响因子：
8.6
作者：
Wittemer, Matthias;Hakelberg, Frederick;Schaetz, Tobias
通讯作者：
Schaetz, Tobias
相干耦合二组分原子凝聚体中的黑洞激光
影响因子：
2.9
作者：
Butera S
通讯作者：
Butera S