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Martino Stefanini1, Yi-Fan Qu2, Tilman Esslinger3

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Researchers show the Kondo effect can arise from non-linear dissipation, not just unitary dynamics. This opens new avenues for studying strongly correlated phenomena using ultracold atoms and transport experiments.

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Theoretical physicsUltracold gases

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Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Systems
  • Atomic, Molecular, and Optical Physics

Background:

  • The Kondo effect is a key phenomenon in strongly correlated systems, typically explained by unitary (coherent) dynamics.
  • Understanding the interplay between coherent and incoherent processes is crucial for advancing quantum many-body physics.

Purpose of the Study:

  • To demonstrate the induction of the Kondo effect via non-linear dissipative channels.
  • To explore generalizations of the Kondo model using dissipative engineering.
  • To propose experimental realizations with ultracold atoms.

Main Methods:

  • Modeling a system of non-interacting fermions interacting with impurity sites subject to two-body losses.
  • Analyzing the Anderson impurity model with residual dissipation as a perturbation.
  • Extending the model to multiple lossy sites for higher spin generalizations.

Main Results:

  • The Kondo effect is shown to emerge from non-linear dissipative processes without coherent impurity interaction.
  • A single lossy site recovers the Anderson impurity model with dissipation competing with the Kondo effect.
  • Generalizations to multi-site systems realize Kondo models with spin 1 or higher.

Conclusions:

  • Non-linear dissipation offers a novel route to engineer and study the Kondo effect.
  • Ultracold atom experiments provide a promising platform for observing dissipative Kondo phenomena via conductance measurements.
  • This work bridges coherent and incoherent dynamics in strongly correlated systems.