Front dynamics in the XY chain after local excitations

Viktor Eisler*, Florian Maislinger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We study the time evolution of magnetization and entanglement for initial states with local excitations, created upon the ferromagnetic ground state of the XY chain. For excitations corresponding to a single or two well separated domain walls, the magnetization profile has a simple hydrodynamic limit, which has a standard interpretation in terms of quasiparticles. In contrast, for a spin-flip we obtain an interference term, which has to do with the nonlocality of the excitation in the fermionic basis. Surprisingly, for the single domain wall the hydrodynamic limit of the entropy and magnetization profiles are found to be directly related. Furthermore, the entropy profile is additive for the double domain wall, whereas in case of the spin-flip excitation one has a nontrivial behaviour.
Original languageEnglish
Article number037
JournalSciPost Physics
Issue number3
Publication statusPublished - 6 Mar 2020


  • cond-mat.stat-mech
  • quant-ph

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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