Related Experiment Video
Updated: Mar 22, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
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.
None:
One of the manifestations of the quantum Mpemba effect (QME) is that a tilted ferromagnet exhibits faster restoration of the spin-rotational symmetry after a quantum quench when starting from a larger tilt angle. This phenomenon has recently been observed experimentally in an ion trap that simulates a long-range spin chain. However, the underlying mechanism of the QME in the presence of long-range interactions remains unclear. Using the time-dependent spin-wave theory, we investigate the dynamical restoration of the spin-rotational symmetry and the QME in generic long-range spin systems. We show that quantum fluctuations of the magnetization drive the restoration of symmetry by melting the initial ferromagnetic order and are responsible for the QME. We find that this effect occurs across a wide parameter range in long-range systems, in contrast to its absence in some short-range counterparts.
Related Concept Videos
Atomic Nuclei: Nuclear Spin State Overview
Atomic Nuclei: Nuclear Relaxation Processes
The Pauli Exclusion Principle
Atomic Nuclei: Nuclear Spin State Population Distribution
Atomic Nuclei: Nuclear Magnetic Moment
NMR Spectroscopy: Spin–Spin Coupling

