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We investigate the effect of the position of the donor in the quantum well onthe energy spectrum and the oscillator strength of the D- system in thepresence of a perpendicular magnetic field. As a function of the magnetic fieldwe find that when the D- centers are placed sufficiently off-center theyundergo singlet-triplet transitions which are similar to those found inmany-electron parabolic quantum dots. The main difference is that the number ofsuch transitions depends on the position of the donor and only a finite numberof such singlet-triplet transitions are found as function of the strength ofthe magnetic field. For sufficiently large magnetic fields the two electronsystem becomes unbound. For the near center D- system no singlet-triplet and nounbinding of the D- is found with increasing magnetic field. A magnetic fieldvs. donor position phase diagram is presented that depends on the width of thequantum well.

physical review. b, condensed matter

Off-center<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>centers in a quantum well in the presence of a perpendicular magnetic field: Angular-momentum transitions and magnetic evaporation

Off-centerD−centers in a quantum well in the presence of a perpendicular magnetic field: Angular-momentum transitions and magnetic evaporation