Entanglement in the One-dimensional Kondo Necklace Model

Abstract

We discuss the thermal and magnetic entanglement in the one-dimensional Kondo necklace model. Firstly, we show how the entanglement naturally present at zero temperature is distributed among pairs of spins according to the strength of the two couplings of the chain, namely, the Kondo exchange interaction and the hopping energy. The effect of the temperature and the presence of an external magnetic field is then investigated, being discussed the adjustment of these variables in order to control the entanglement available in the system. In particular, it is indicated the existence of a critical magnetic field above which the entanglement undergoes a sharp variation, leading the ground state to a completely unentangled phase.

8 pages, 13 EPS figures. v2: four references added

References in corpus (7)

• Scaling of Entanglement close to a Quantum Phase Transitions
• Entanglement in a simple quantum phase transition
• Entanglement in the Quantum Heisenberg XY model
• Entanglement Properties of the Harmonic Chain
• Thermal concurrence mixing in a 1D Ising model
• Impurity Scattering Induced Entanglement of Ballistic Electrons
• Role of Disorder on the Quantum Critical Point of a Model for Heavy Fermions

Cited by in corpus (8)

• Tunable Non-local Spin Control in a Coupled Quantum Dot System
• Entanglement Observables and Witnesses for Interacting Quantum Spin Systems
• Experimental observation of quantum entanglement in low dimensional spin systems
• Boundary and impurity effects on entanglement of Heisenberg chains
• Entanglement and quantum phase transition in quantum mixed spin chains
• Entanglement in the Bogoliubov vacuum
• Entanglement in Anderson Nanoclusters
• Quantum phase transitions in the Kondo-necklace model: Perturbative continuous unitary transformation approach