We study theoretically the lifetimes of attractive and repulsive Fermi polarons, as well as the
molecule at finite momentum in three dimensions. To this end, we develop a technique that …

We investigate the behavior of a mobile spin-1/2 impurity atom immersed in a Fermi gas,
where the interacting spin-↑ and noninteracting spin-↓ states of the impurity are Rabi …

We develop a general theory of Fermi polarons at nonzero temperature, including particle-
hole excitations of the Fermi sea shakeup to arbitrarily high orders. The exact set of …

We consider a spin impurity with multiple energy levels moving in a noninteracting Fermi
sea and theoretically solve this Fermi-spin-polaron problem at nonzero temperature by …

We investigate the fundamental problem of a small density of bosonic impurities immersed
in a dilute Bose gas at zero temperature. Within the perturbative regime of weak interactions …

Despite the paradigmatic nature of the Fermi-polaron model, the theoretical description of its
nonlinear dynamics poses challenges. Here, we apply a quantum kinetic theory of driven …

Crossed optical dipole traps (ODTs) provide three-dimensional confinement of cold atoms
and other optically trappable particles. However, the need to maintain the intersection of the …

Predicting the emergent properties of impurities immersed in a quantum bath is a
fundamental challenge that can defy quasiparticle treatments. Here, we measure the …

By using both diagrammatic theory and Chevy ansatz approach, we derive an exact set of
equations, which determines the spectral function of Fermi polarons with multiple particle …

In this thesis, field theoretical and variational methods are applied to few-and many-body
problems of strongly interacting ultracold atomic gases and atomicallythin semiconductors …