Journal
PHYSICAL REVIEW B
Volume 97, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.205103
Keywords
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Funding
- National Science Foundation [PHY-1314295]
- CNPq
- INCT-IQ
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We study the light-cone velocity for global quenches in the noninteracting XY chain starting from a class of initial states that are eigenstates of the local z component of the spin. We point out how translation invariance of the initial state can affect the maximal speed at which correlations spread. As a consequence the light-cone velocity can be state dependent also for noninteracting systems: a new effect of which we provide clear numerical evidence and analytic predictions. Analogous considerations, based on numerical results, are drawn for the evolution of the entanglement entropy.
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