2009

Entanglement entropy of excited states

Alba, Vincenzo, Fagotti, Maurizio, Calabrese, Pasquale

Understand

We study the entanglement entropy of a block of contiguous spins in excited states of spin chains.

  • We consider the XY model in a transverse field and the XXZ Heisenberg spin-chain.
  • For the latter, we developed a numerical application of algebraic Bethe Ansatz.
  • We find two main classes of states with logarithmic and extensive behavior in the dimension of the block, characterized by the properties of excitations of the state.

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