Unconventional effects in Fermi Liquids

DIPC Seminars

Dmitrii Efremov, Institute for Solid State Physics, IFW Dresden, Germany
Donostia International Physics Center
Add to calendar
Subscribe to Newsletter
Unconventional effects in Fermi Liquids The Landau Fermi liquid theory is considered as the simplest model for description of metals. Within this model, the thermodynamic quantities are considered to obey the universal laws. But already far from any instability, these quantities contain sub-leading terms which are driven by electron- electron interactions. We will show how the thermodynamics of Fermi liquids is affected by these corrections. In addition, recently it was recognized that a wide variety of complex phases in quantum materials are boosted up by density of states enhancement. A well- known example occurs at van Hove singularities where the Fermi surface undergoes a topological transition. Higher-order singularities, where multiple disconnected leaves of Fermi surface touch all at once, can naturally occur at points of high symmetry in the Brillouin. Such multicritical singularities can lead to stronger divergences in the density of states than canonical van Hove singularities. As a concrete example of the power of these Fermi surface topological transitions, we demonstrate how they can be used in the analysis of experimental data on Sr3Ru2O7. Understanding the related mechanisms opens up new avenues in the material design of complex quantum phases. Hosts: Vyacheslav Silkin