Seminarium Fizyki Materii Skondensowanej

Condensed matter physics is the physics of solids and liquids (condensed phases of matter). It is the study of the complex behaviour of a large number of interacting particles such that their collective behaviour gives rise to emergent properties. In this talk, I will discuss some interesting quantum condensed matter systems with theirintriguing emergent phenomena arising from complexity.I will revisit Landau's Fermi liquid (FL) theory for normal metals, and thereby outline the properties of the non-Fermi liquid (NFL) metals (also called "strange" metals) which cannot be described within the Landau framework, due to the destruction of the Landau quasiparticles. In particular, I will focus on critical Fermi surface states, where there is a well-defined Fermi surface, but no quasiparticles, as a result of strong interactions between the Fermisurface and some emergent massless boson(s). I will outline a framework to extract the low-energy physics of such systems in a controlled approximation, using the tool of dimensional regularization.The seminar will be held online. You may join by following the link: https://us02web.zoom.us/j/83686899432?pwd=RXNtZkhtZFpLazVmMVRFY1BtVlI0Zz09