4 research outputs found
Impurity Effects in Two-Electron Coupled Quantum Dots: Entanglement Modulation
We present a detailed analysis of the electronic and optical properties of
two-electron quantum dots with a two-dimensional Gaussian confinement
potential. We study the effects of Coulomb impurities and the possibility of
manipulate the entanglement of the electrons by controlling the confinement
potential parameters. The degree of entanglement becomes highly modulated by
both the location and charge screening of the impurity atom, resulting two
regimes: one of low entanglement and other of high entanglement, with both of
them mainly determined by the magnitude of the charge. It is shown that the
magnitude of the oscillator strength of the system could provide an indication
of the presence and characteristics of impurities that could largely influence
the degree of entanglement of the system.Comment: Regular Article (Journal of Physics B, in press), 9 pages, 10 figure