Electron-nuclear entanglement in the cold lithium gas

The effects of the temperature were taken into account and some authors used thermal entanglement to study the electron spin system or other models at finite temperature in Refs.[2,3,4]. For example, X.G. Wang investigated the isotropic Heisenberg XXX model at finite temperature[3]. Y. Sun et al. investigated the thermal entanglement in the two-qubit Heisenberg XY model in nonuniform magnetic fields[4]. On the other hand, the entanglement at the critical point is also a hot point[5,6]. For instance, Osterloh et al. demonstrated that for a class of one-dimensional magnetic systems, that entanglement shows scaling behavior in the vicinity of the transition point[5]