Thermal Quantum Discord in Anisotropic Heisenberg XXZ Model with Dzyaloshinskii-Moriya Interaction

The thermal quantum discord （QD） is studied in a two-qubit Heisenberg XXZ system with Dzyaloshinskii-Moriya（DM） interaction.We compare the thermal QD with thermal entanglement in this system and find remarkabledifferences between them.For instance,we show situations where QD decreases asymptotically to zero with temperatureT while entanglement decreases to zero at the point of critical temperature,situations where QD decreases with certaintunable parameters such as D;and D;when entanglement increases.We find that the characteristic of QD is exotic inthis system and this possibly offers a potential solution to enhance entanglement of a system.We also show that tunableparameter D;is more efficient than parameter D;in most regions for controlling the QD.