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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.6: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Lifshitz Transitions in Neutral Fermi Surfaces — •Vaishnavi Jayakumar and Ciaran Hickey — Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

In his seminal 1960 paper, I. M. Lifshitz predicted the existence of a transition where the Fermi surface of a metal changes its topology, as a Van Hove singularity crosses the Fermi energy. These "Electronic Topological Transitions", or "Lifshitz transitions" , leave a strong imprint on thermodynamic and transport observables, and have since been observed in a variety of metals.

Here, we examine the consequences of a Lifshitz transition in a neutral Fermi surface, i.e. a metal of fermionic quasiparticles that are charge neutral. Such an exotic Fermi surface can arise in strongly correlated systems, with a paradigmatic example being the spinon Fermi surface of a U(1) quantum spin liquid.

We discuss the unique signatures of Lifshitz transitions in neutral metals, and compare and contrast them with the conventional electronic case. Similarly, we also discuss the recently classified multicritical Lifshitz transitions and their potential experimental fingerprints in spinon Fermi surface states.