Unconventional effects in Fermi Liquids
DIPC Seminars
- Speaker
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Dmitrii Efremov, Institute for Solid State Physics, IFW Dresden, Germany
- When
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2020/02/25
13:00 - Place
- Donostia International Physics Center
- Add to calendar
-
iCal
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