耦合到费米海的重极化子和分子的谱
Spectra of heavy polarons and molecules coupled to a Fermi sea
摘要：
我们研究了耦合到费米海的杂质的光谱（例如，超冷气体中的少数原子、固体中的激子）通过足够强的吸引力形成分子/激子。我们介绍了一个图解计划，它允许治疗有限质量的杂质，同时再现费米边缘奇点在不动的限制。对于大的结合能的光谱的特点是由一个半相干的排斥极化子和一个不相干的分子-空穴连续，这是最低的单粒子光谱的能量特征。先前预测的吸引极化子似乎不存在强结合。
英文摘要：
We study the spectrum of an impurity coupled to a Fermi sea (e.g., minority atom in an ultracold gas, exciton in a solid) by attraction strong enough to form a molecule/trion. We introduce a diagrammatic scheme which allows treating a finite mass impurity while reproducing the Fermi edge singularity in the immobile limit. For large binding energies the spectrum is characterized by a semi-coherent repulsive polaron and an incoherent molecule-hole continuum, which is the lowest-energy feature in the single-particle spectrum. The previously predicted attractive polaron seems not to exist for strong binding.
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