We investigate the quantum phase transition (OPT) and the pairwise thermal entanglement in the three- qubit Heisenberg XXX chain with Dzyaloshinskii Moriya (DM) interaction under a magnetic field. The ground state...We investigate the quantum phase transition (OPT) and the pairwise thermal entanglement in the three- qubit Heisenberg XXX chain with Dzyaloshinskii Moriya (DM) interaction under a magnetic field. The ground states of the system exist crossing points, which shows that the system exhibits a Q, PT. At a given temperature, the entanglement undergoes two sudden changes (platform-like behavior) as the DM interaction or external magnetic field increases. This special property can be used as the entanglement switch, which is also influenced by the temperature. We can modulate the DM interaction or external magnetic field to control the entanglement switch.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No. 10775088the Shandong Natural Science Foun-dation under Grant No. ZR2011AM018the Specialized Research Fund for the Doctoral Program of Higher Education under GrantNo. 20103705110001
文摘We investigate the quantum phase transition (OPT) and the pairwise thermal entanglement in the three- qubit Heisenberg XXX chain with Dzyaloshinskii Moriya (DM) interaction under a magnetic field. The ground states of the system exist crossing points, which shows that the system exhibits a Q, PT. At a given temperature, the entanglement undergoes two sudden changes (platform-like behavior) as the DM interaction or external magnetic field increases. This special property can be used as the entanglement switch, which is also influenced by the temperature. We can modulate the DM interaction or external magnetic field to control the entanglement switch.