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Floquet Fermi Liquid.

Li-Kun Shi1, Oles Matsyshyn2, Justin C W Song2

  • 1Institut für Theoretische Physik, Universität Leipzig, Brüderstraße 16, 04103, Leipzig, Germany.

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|April 19, 2024
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Summary
This summary is machine-generated.

We discovered a novel nonequilibrium Floquet Fermi liquid state with nested Fermi surfaces. This state exhibits unique quantum oscillations and tunable properties, offering new insights into driven quantum matter.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Driven Quantum Systems

Background:

  • Understanding nonequilibrium quantum states is crucial for advancing quantum technologies.
  • Floquet theory describes systems periodically driven out of equilibrium.
  • Fermi liquids are fundamental to understanding metals, but their nonequilibrium behavior is less explored.

Purpose of the Study:

  • To demonstrate the existence of a novel nonequilibrium Floquet Fermi liquid state.
  • To characterize the properties of this state, including its Fermi surfaces and response to magnetic fields.
  • To explore methods for tuning the properties of these Floquet Fermi surfaces.

Main Methods:

  • Theoretical modeling of partially filled Floquet Bloch bands coupled to fermionic baths.
  • Analysis of quantum oscillations under magnetic fields.
  • Investigation of specific heat and thermodynamic density of states.
  • Exploration of drive frequency control on Floquet Fermi surfaces.

Main Results:

  • Demonstrated the existence of a nonequilibrium Floquet Fermi liquid state with nested "Floquet Fermi surfaces."
  • Observed quantum oscillations with slow beating patterns, consistent with experimental microwave-induced resistance oscillations.
  • Showcased the ability to tune Floquet Fermi surfaces towards nonequilibrium Van Hove singularities by controlling drive frequency.

Conclusions:

  • The identified Floquet Fermi liquid state offers a new paradigm for understanding driven quantum matter.
  • The observed phenomena provide a framework for interpreting experimental results in microwave-induced resistance oscillations.
  • This work opens avenues for controlling quantum states and exploring novel phenomena in periodically driven systems.