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Updated: Mar 22, 2026

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

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Quantum Mpemba Effect in Long-Range Spin Systems.

Shion Yamashika¹, Filiberto Ares²

¹The University of Electro-Communications, Department of Engineering Science, Tokyo 182-8585, Japan.

Physical Review Letters

|March 20, 2026

Summary

This summary is machine-generated.

The quantum Mpemba effect (QME) shows larger tilt angles restore spin symmetry faster in ferromagnets. Quantum fluctuations drive this symmetry restoration and the QME in long-range systems.

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Area of Science:

Condensed Matter Physics
Quantum Dynamics
Statistical Mechanics

Background:

The quantum Mpemba effect (QME) describes faster symmetry restoration in quantum systems.
Experimental observations of QME exist in ion traps simulating long-range spin chains.
The mechanism of QME in long-range interacting systems is not fully understood.

Purpose of the Study:

Investigate the dynamical restoration of spin-rotational symmetry.
Clarify the underlying mechanism of the QME in long-range spin systems.
Determine the role of quantum fluctuations and interactions in QME.

Main Methods:

Utilized time-dependent spin-wave theory.
Analyzed generic long-range spin systems.
Studied the dynamics of magnetization and symmetry restoration.

Main Results:

Quantum fluctuations of magnetization drive symmetry restoration by melting ferromagnetic order.
These fluctuations are identified as the cause of the QME.
The QME is observed across a wide parameter range in long-range systems.

Conclusions:

Quantum fluctuations are the key mechanism behind QME in long-range spin systems.
The QME is robust in long-range systems, unlike in some short-range systems.
This research provides a theoretical framework for understanding QME in diverse quantum systems.