Collisional Properties of a Polarized Fermi Gas with Resonant Interactions

欠阻尼布朗碰撞发动机的热力学：新见解与共振现象

Thermodynamics of underdamped Brownian collisional engines: New insights and resonant phenomena

本文将碰撞发动机概念拓展至欠阻尼布朗粒子，系统比较欠阻尼与过阻尼功-功发动机性能，发现欠阻尼发动机因存在共振区域而在广泛参数范围内同时提升效率与功率输出，揭示了动力学选择与驱动协议对优化发动机性能的关键作用。

Collisional Frequency Shifts of Absorption Lines in an Atomic Hydrogen Gas

We consider the effect of interactions on the line shape of the two-photon 1s-2s transition in a (doubly) spin-polarized atomic hydrogen gas in terms of the interatomic interaction potentials. We show that the frequency-weighted sum rule for the intensity of the line is not given simply in terms of the pseudopotentials that describe the interactions between low-energy atoms. The origin of the departures from the simple pseudopotential result for the frequency-weighted sum rule is traced to what we refer to as incoherent contributions to the spectral weight. These arise from more complicated fi…

Single particle spectrum of resonant population imbalanced Fermi gases

We use a T-matrix approximation to calculate the single particle spectrum of the normal state of a gas of Fermionic atoms at low temperature. In the strongly interacting regime of the polarized gas, we find that the spectrum is separated in two branches, leading to a double-peaked radiofrequency spectral feature.