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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Multiband Quantum Criticality of Polar Metals.

Pavel A Volkov^1,2, Premala Chandra^1,2

¹Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters

|July 1, 2020

Summary

Researchers explored strong correlations in polar metals by tuning the polar transition temperature to zero. They discovered novel interacting phases, like non-Fermi liquids, with potential experimental signatures.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

Recent experiments realized polar metals with broken inversion symmetry.
Tuning the polar transition temperature to zero is a key experimental frontier.

Purpose of the Study:

Explore strong correlations driven by criticality in polar metals at zero transition temperature.
Investigate the coupling between critical fluctuations and electrons in multiband systems.
Identify and characterize novel interacting electronic phases and their experimental signatures.

Main Methods:

Theoretical modeling of multiband metals near a polar quantum critical point.
Analysis of electron-critical mode coupling.
Characterization of emergent electronic phases.

Main Results:

Demonstrated a robust mechanism for electron-critical mode coupling, overcoming prior challenges.
Identified novel interacting phases, including non-Fermi liquids, particularly when band crossings are near the Fermi level.
Characterized distinct experimental signatures for three generic types of band crossings.

Conclusions:

Criticality in polar metals provides a route to strong electronic correlations and novel quantum phases.
The identified non-Fermi liquid states and their signatures offer promising avenues for experimental verification.
This work provides a theoretical framework for understanding and discovering new correlated electron phenomena in broken-symmetry materials.