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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Quantum-Acoustical Drude Peak Shift.

Joonas Keski-Rahkonen^1,2, Xiaoyu Ouyang^3,4, Shaobing Yuan⁴

¹Department of Physics, Harvard University, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|May 17, 2024

Summary

This summary is machine-generated.

Quantum acoustics offers a new way to study electron-phonon interactions. This framework reveals why strange metals have high-temperature absorption peaks, linking it to lattice disorder and non-Drude conductivity.

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Area of Science:

Condensed matter physics
Quantum optics
Solid-state physics

Background:

The Fröhlich model describes electron-phonon interactions but lacks a real-space, nonperturbative treatment.
Understanding high-temperature absorption peaks in strange or bad metals is a key challenge.

Purpose of the Study:

To introduce quantum acoustics as a framework for electron-phonon interactions.
To explain the origin of high-temperature absorption peaks in strange metals using this new framework.

Main Methods:

Developed quantum acoustics for a nonperturbative, coherent, real-space treatment of electron-phonon interactions.
Analyzed the optical conductivity within the Fröhlich model using the quantum-acoustical representation.

Main Results:

Revealed a displaced Drude peak in the optical conductivity, showing a finite frequency maximum in the far-infrared.
Demonstrated suppression of DC conductivity.
Identified dynamical lattice disorder as the cause of non-Drude behavior in strange metals.

Conclusions:

Quantum acoustics provides a powerful new perspective on electron-phonon interactions.
Dynamical lattice disorder is crucial for understanding the optical properties of strange metals.
The findings explain the origin of high-temperature absorption peaks in these materials.