Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 56: Correlated Electrons: Quantum-Critical Phenomena
TT 56.2: Talk
Thursday, March 19, 2020, 09:45–10:00, HSZ 304
Fermi surface topological transition in Sr3Ru2O7 — •Dmitri Efremov1, Alex Shtyk2, Andreas Rost3, Claudio Chamon4, Andrew Mackenzie6, and Joseph Betouras5 — 1IFW, Dresden — 2Harvard University, Cambridge — 3University of St Andrews,St Andrews — 4Boston University, Boston — 5Loughborough University, Loughborough — 6Max Planck Institute for Chemical Physics of Solids, Dresden
A wide variety of complex phases in quantum materials are driven by electron-electron interactions, which are enhanced through density of states peaks. A well-known example occurs at van Hove singularities where the Fermi surface undergoes a topological transition. Here we discuss that higher order singularities, where multiple disconnected leaves of Fermi surface touch all at once, naturally can occur at points of high symmetry in the Brillouin zone. 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 material design of complex quantum phases