By fundamental physics I mean branch of physics which deals with most fundamental structure and behaviour of the matter which is widely known as "Particle physics or High energy physics". Some might consider condensed matter physics as more fundamental as it explains emergent behaviour of collection of particles. I don't consider that a good argument as there is not any single example of strong emergence in our nature; if there is it might be the consciousness but still many neuroscientists believe that consciousness is weak emergence meaning it can be explained via study of all the matter which makes up brain.