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Demystifying quantum phase transitions: A guide to dynamical relaxation in XY spin chains

Published on:

29 April 2023

Primary Category:

Statistical Mechanics

Paper Authors:

Yin-Tao Zou,

Chengxiang Ding

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Key Details

Studies universal dynamics of XY chains after quenching their parameters

Focuses on quenches to or from quantum critical points

Reveals new power-law scaling behaviors and crossovers in 'critical quenches'

Relates dynamical scaling laws to closing of energy gaps at criticality

Finds new crossover scaling when quenching near multicritical points

AI generated summary

Demystifying quantum phase transitions: A guide to dynamical relaxation in XY spin chains

This paper studies how quantum XY spin chains relax after sudden changes ('quenches') to their environment. It focuses on cases where the spin chain is initially at, or quenched to, a quantum critical point - special points where the chain's behavior changes dramatically. The study reveals several interesting dynamical relaxation behaviors in these 'critical quenches', including crossovers between different power-law scaling regimes. The results provide insight into quantum criticality and universal dynamics in spin chains.

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