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Related Experiment Video

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Dynamical Axions in U(1) Quantum Spin Liquids.

Salvatore D Pace^1,2, Claudio Castelnovo², Chris R Laumann³

¹Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters

|March 3, 2023

Summary

Physicists propose a new way to find axions (exotic particles) in quantum spin liquids, a type of magnetic material. This could lead to new experimental methods for detecting these elusive particles.

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Area of Science:

Condensed Matter Physics
Particle Physics
Quantum Materials

Background:

Axions, proposed half a century ago, are sought in high-energy and condensed matter physics.
Experimental searches for axions have yielded limited success, with notable findings in topological insulators.

Purpose of the Study:

Propose a novel mechanism for realizing axions in quantum spin liquids.
Identify experimental signatures and candidate materials for axion detection.

Main Methods:

Investigate symmetry requirements for axion realization in quantum spin liquids.
Analyze the coupling of axions to external and emergent electromagnetic fields.
Utilize inelastic neutron scattering to detect characteristic dynamical responses.

Main Results:

Axions can be realized in quantum spin liquids, particularly in pyrochlore materials.
The interaction between axions and emergent photons produces a measurable dynamical response.
Inelastic neutron scattering is proposed as a key experimental technique.

Conclusions:

This work provides a new avenue for axion research in condensed matter systems.
It highlights the potential of frustrated magnets as tunable platforms for studying axion electrodynamics.