Berlin 2024 – wissenschaftliches Programm
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 1: Many-body Theory I
MP 1.7: Vortrag
Montag, 18. März 2024, 12:00–12:20, HL 001
The Ultra quantum critical Floquet Non-Fermi Liquid — •Likun Shi1, Inti Sodemann Villadiego1, Oles Matsyshyn2, and Justin Song2 — 1Institute for Theoretical Physics, Leipzig University, Leipzig, Germany — 2Division of Physics and Applied Physics, Nanyang Technological University, Singapore, Republic of Singapore
We demonstrate the existence of a quantum non-equilibrium steady state of periodically driven fermions that has no analogue in equilibrium. This state is a Floquet non-Fermi liquid state that arises for periodically driven fermions coupled to a bosonic bath. It features ’higher order Floquet Fermi surfaces’ where the occupation in momentum space displays cusp-like non-analyticities, but without an associated jump or quasiparticle residue.
More intriguingly, the sharpness of these higher order Floquet Fermi surfaces survives even at finite temperatures, implying that this Floquet Non-Fermi Liquid remains quantum critical at finite temperatures. This property has no analogue in equilibrium systems because finite temperature always smears out the sharpness of the Fermi surfaces, leading the fermions to behave as a classical fluid at sufficiently large distances. We discuss how monochromatic radiation in the microwave range impinging on high-quality electronic systems is a promising regime to realize these states in experiments.
Keywords: Floquet; Non-Fermi Liquid; non-equilibrium