| Autor: |
Ananikian, N. S., Ananikyan, L. N., Chakhmakhchyan, L. A., Rojas, Onofre |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
J. Phys.: Condens. Matter 24 (2012) 256001 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1088/0953-8984/24/25/256001 |
| Popis: |
The entanglement quantum properties of a spin-1/2 Ising-Heisenberg model on a symmetrical diamond chain were analyzed. Due to the separable nature of the Ising-type exchange interactions between neighboring Heisenberg dimers, calculation of the entanglement can be performed exactly for each individual dimer. Pairwise thermal entanglement was studied in terms of the isotropic Ising-Heisenberg model, and analytical expressions for the concurrence (as a measure of bipartite entanglement) were obtained. The effects of external magnetic field $H$ and next-nearest neighbor interaction $J_m$ between nodal Ising sites were considered. The ground-state structure and entanglement properties of the system were studied in a wide range of the coupling constant values. Various regimes with different values of the ground-state entanglement were revealed, depending on the relation between competing interaction strengths. Finally, some novel effects, such as the two-peak behavior of concurrence versus temperature and coexistence of phases with different values of magnetic entanglement were observed. |
| Databáze: |
arXiv |
| Externí odkaz: |
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