We study the bipartite entanglement dynamics in an anisotropic two-qubit Heisenberg XYZ model under the influence of population relaxation and in the presence of various types of magnetic fields. We find that the maximal value of the concurrence has an intrinsic rigidity for the different external magnetic fields. Moreover, our results demonstrate that it is possible to produce entangled states and to control or to modulate the concurrence within the intrinsic maximal value with the help of external time-varying fields despite the existence of dissipation.
We have successfully nickel doped a boron carbide ͑B 5 C͒ alloy film. The nickel doped boron-carbide ͑Ni-B 5 C 1ϩ␦) thin films were fabricated from a single source carborane cage molecule and nickelocene ͓Ni͑C 5 H 5) 2 ͔ using plasma enhanced chemical vapor deposition. Nickel doping transforms the highly resistive undoped film from a p-type material to an n-type material. This has been verified from the characteristics of diodes constructed of NiB 5 C 1ϩ␦ on both n-type silicon and p-type B 5 C. The homojunction diodes exhibit excellent rectifying properties over a wide range of temperatures.
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