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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Reduced Density-Matrix Approach to Strong Matter-Photon Interaction.

Florian Buchholz1, Iris Theophilou1, Soeren E B Nielsen1

  • 1Theory Department, Max Planck Institute for the Structure and Dynamics of Matter - Luruper Chaussee 149, 22761 Hamburg, Germany.

ACS Photonics
|December 3, 2019
PubMed
Summary
This summary is machine-generated.

We developed a new nonperturbative theory for matter-photon interactions using reduced density matrices. This approach accurately describes strongly coupled electronic systems and cavity modes, revealing photon field sensitivity to electronic structure.

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Area of Science:

  • Quantum chemistry
  • Condensed matter physics
  • Strong light-matter interactions

Background:

  • Accurately describing electronic many-body systems coupled to cavity modes is computationally challenging.
  • Existing methods often struggle with strong coupling and correlated electronic effects.

Purpose of the Study:

  • To develop a novel, nonperturbative theoretical framework for systems with strong light-matter coupling.
  • To accurately capture correlations in electronic systems and interactions with cavity photons.

Main Methods:

  • Introducing a higher-dimensional auxiliary system to map the coupled fermion-boson problem to a dressed fermionic system.
  • Employing reduced density-matrix functional theory, adapted for fermionic systems.
  • Applying the method to one-dimensional model systems in real space.

Main Results:

  • Demonstrated the accuracy of simple density-matrix approximations across weak to deep-strong coupling regimes.
  • Showcased the method's applicability to complex systems beyond exact calculation capabilities.
  • Revealed that photon field influence is highly sensitive to specific electronic structure details.

Conclusions:

  • The developed first-principles approach provides a robust tool for studying strongly coupled matter-photon systems.
  • The method overcomes limitations of traditional density-matrix theories for fermion-boson interactions.
  • Further investigations into the interplay between electronic structure and photon fields are warranted.