Exotic correlation spread in free-fermionic states with initial patterns Articles uri icon

publication date

  • June 2022

issue

  • 21

volume

  • 105

International Standard Serial Number (ISSN)

  • 1098-0121

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

abstract

  • (copyright) 2022 American Physical Society.We describe a relation between the light-cone velocities after a quantum quench and the internal structure of the initial state, in the particular case of free fermions on a chain at half filling. The considered states include short-range valence bond solids, i.e., dimerized states, and long-range states such as the rainbow. In all the considered cases the correlations spread into one or a few well-defined light cones, each of them presenting an effective velocity which can be read from the form factor. Interestingly, we find that the observed velocities range from zero to the Fermi velocity and may not always be obtained from the dispersion relation for valid momenta.