Characterizing the thermal quantum correlations in a two-qubit Heisenberg XXZ spin-1/2 chain under Dzyaloshinskii-Moriya and Kaplan-Shekhtman-Entin-Wohlman-Aharony interactions

Abstract We considered the two-qubit Heisenberg XXZ spin chain in the presence of Dzyaloshinskii--Moriya (DM) and Kaplan--Shekhtman--Entin--Wohlman--Aharony (KSEA) interactions in thermal equilibrium. As discord-type quantifiers of thermal non-classical correlations, we used trace distance discord and local quantum uncertainty. Depending on the thermal state of the system considered, the explicit analytical expressions of the suggested quantifiers are derived and their behaviors with respect to the various parameters of the system are examined. The results obtained showed that the DM and KSEA interactions considerably improve the quantum correlations contained in the bipartite system while the temperature tends to decrease their quantity.