Journal
PHYSICAL REVIEW RESEARCH
Volume 4, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.4.L022023
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Funding
- NSF [DMR-1553991, 2041995]
- Deutsche Forschungsgemeinschaft (DFG) [RO 2247/11-1, 406116891, RTG 2522/1]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [2041995] Funding Source: National Science Foundation
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This study investigates the dependence of the static structure factor on observation time after a quantum quench in an integrable system of one-dimensional fermions, finding excellent agreement between bosonic entropy and fermionic entanglement entropy.
Following a sudden change of interactions in an integrable system of one-dimensional fermions, we analyze the dependence of the static structure factor on the observation time after the quantum quench. At small waiting times after the quench, we map the system to noninteracting bosons such that we are able to extract their occupation numbers from the Fourier transform of the density-density correlation function, and use these to compute a bosonic entropy from a diagonal ensemble. By comparing this bosonic entropy with the asymptotic steady-state entanglement entropy per fermion computed with exact diagonalization, we find excellent agreement.
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