6533b853fe1ef96bd12ac19b

RESEARCH PRODUCT

Thermal entanglement of a spin-1/2 Ising–Heisenberg model on a symmetrical diamond chain

Levon ChakhmakhchyanOnofre RojasL. N. AnanikyanNerses Ananikian

subject

CRYPTOGRAPHYFOS: Physical sciences02 engineering and technologyQuantum entanglement01 natural sciencesCondensed Matter - Strongly Correlated ElectronsMAGNETIC-PROPERTIESSYSTEMSQuantum mechanics0103 physical sciencesGeneral Materials ScienceFIELD010306 general physicsSpin (physics)QuantumANTIFERROMAGNETSPhysicsCoupling constantCOMPOUND CU-3(CO3)(2)(OH)(2)Strongly Correlated Electrons (cond-mat.str-el)Heisenberg modelQUANTUM ENTANGLEMENTConcurrenceQuantum Physics021001 nanoscience & nanotechnologyCondensed Matter PhysicsCondensed Matter - Other Condensed MatterSTATESFRUSTRATIONIsing model0210 nano-technologyGround stateOther Condensed Matter (cond-mat.other)

description

International audience; 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 coupling constant values. Various regimes with different values of 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.

yearjournalcountryeditionlanguage
2011-10-28Journal of Physics: Condensed Matter
https://doi.org/10.1088/0953-8984/24/25/256001