Dilute-gas Bose Einstein condensates (BECs) are an extremely versatile tool for the investigation of quantum phenomena. BECs provide a unique access to the quantum world leading to new insights into a broad range of areas including atomic physics, quantum optics, condensed matter physics, and quantum computation, to name a few. In this talk, I will discuss our experiments focusing on Raman dressing of BEC which makes it possible to generate artificial gauge fields and spin-orbit coupling, two prominent topics from condensed-matter physics. I will highlight key results obtained by applying these techniques to problems from nonlinear dynamics. For example, we have generated dispersion relations featuring a roton-like minimum and a region of negative effective mass, leading to peculiar quantum hydrodynamic behavior.