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¹H NMR: Interpreting Distorted and Overlapping Signals

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¹H NMR: Long-Range Coupling

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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Long-Lived Higgs Modes in Strongly Correlated Condensates.

J Lorenzana¹, G Seibold²

¹ISC-CNR and Department of Physics, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.

Physical Review Letters

|January 26, 2024

Summary

We found that amplitude fluctuations in the Hubbard model can become undamped Higgs oscillations in strongly coupled systems. This prediction opens avenues for detecting the spin-type Higgs mode in materials like cuprates.

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Area of Science:

Condensed Matter Physics
Quantum Materials
Many-Body Physics

Background:

The Hubbard model is a fundamental model for strongly correlated electron systems.
Understanding order parameter fluctuations is crucial for characterizing exotic phases of matter.

Purpose of the Study:

Investigate order parameter fluctuations in the Hubbard model using a time-dependent Gutzwiller approach.
Predict the existence of undamped amplitude (Higgs) oscillations in strongly coupled systems.

Main Methods:

Time-dependent Gutzwiller approach applied to the Hubbard model.
Analysis of order parameter fluctuations across different coupling strengths.

Main Results:

In the weak coupling limit, fluctuations are short-lived.
Increasing interaction strength shifts fluctuations below the quasiparticle continuum edge.
Prediction of undamped Higgs oscillations in strongly coupled superconductors, cold atomic fermion condensates, and density wave systems.

Conclusions:

The study predicts observable Higgs oscillations in various strongly correlated systems.
Proposes an experimental method to detect the spin-type Higgs mode in cuprates via Faraday effect, leveraging Dzyaloshinsky-Moriya interaction.