Holographic entanglement entropy close to crossover/phase transition in strongly coupled systems

Understand

We investigate the behavior of entanglement entropy in the holographic QCD model proposed by Gubser et al.

• By choosing suitable parameters of the scalar self-interaction potential, this model can exhibit various types of phase structures: crossover, first order and second order phase transitions.
• We use entanglement entropy to probe the crossover/phase transition, and find that it drops quickly/suddenly when the temperature approaches the critical point which can be seen as a signal of confinement.
• Moreover, the critical behavior of the entanglement entropy suggests that we may use it to characterize the corresponding phase structures.