Excitonic states of an impurity in a Fermi gas
Excitonic states of an impurity in a Fermi gas
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费米气体中杂质的激子态
DOI：
10.1103/physreva.92.053605
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发表时间：
2015
影响因子：
2.9
通讯作者：
Lan Z
中科院分区：
文献类型：
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作者：
Lan Z
我们研究了费米气体中原子杂质的激子态，即由杂质和空穴组成的束缚态。先前的研究考虑了杂质与来自费米海的粒子的束缚态，其中的空穴只形成了粒子-空穴修饰的一部分。在双通道模型中，我们发现，对于大范围的参数，激子态不是基态而是亚稳态。我们进一步计算了激子态到极化子态和二聚子态的衰变速率，发现它们是长寿命的，缩放的。我们还发现，在光谱测量中，除了已知的二角体-空穴连续体外，还应考虑新的激子-粒子态连续体。因此，激子必须被认为是目前正在实验中探索的亚稳态物理研究中的一种新成分。
We study excitonic states of an atomic impurity in a Fermi gas, i.e., bound states consisting of the impurity and a hole. Previous studies considered bound states of the impurity with particles from the Fermi sea where the holes formed only part of the particle-hole dressing. Within a two-channel model, we find that, for a wide range of parameters, excitonic states are not ground but metastable states. We further calculate the decay rates of the excitonic states to polaronic and dimeronic states and find they are long-lived, scaling asand. We also find that a new continuum of exciton-particle states should be considered alongside the previously known dimeron-hole continuum in spectroscopic measurements. Excitons must therefore be considered a new ingredient in the study of metastable physics currently being explored experimentally.
S. Matsubara：“4. 体内典型和非典型抗精神病药物对多巴胺 D-1、D-2 和血清素 2 受体的占用。”
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