Entanglement in the Heisenberg spin chain with multiple interaction

摘要

The ground state and thermal entanglement of a Heisenberg spin chain in the presence of the multiple coupling interaction (type of XZXYZY and type of XZY-YZX) is investigated. It is found that the role of the type of XZY-YZX interaction to the entanglement is identical to the DzyaloshinskyMoriya interaction. For a XZXYZY type three-site interaction, the results show that this interaction can excite and enhance the entanglement even at the higher temperature.