Off center $D^-$ centers in a quantum well in the presence of a perpendicular magnetic field: angular momentum transition and magnetic evaporation

Details Off center $D^-$ centers in a quantum well in the presence of a perpendicular magnetic field: angular momentum transition and magnetic evaporation Off center $D^-$ centers in a quantum well in the presence of a perpendicular magnetic field: angular momentum transition and magnetic evaporation

1998-05-13

arxiv.org/abs/cond-mat/9805154v1

Phys. Rev. B 57, 15392,(1998)

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 17 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.57.15392

We investigate the effect of the position of the donor in the quantum well on the energy spectrum and the oscillator strength of the D- system in the presence of a perpendicular magnetic field. As a function of the magnetic field we find that when the D- centers are placed sufficiently off-center they undergo singlet-triplet transitions which are similar to those found in many-electron parabolic quantum dots. The main difference is that the number of such transitions depends on the position of the donor and only a finite number of such singlet-triplet transitions are found as function of the strength of the magnetic field. For sufficiently large magnetic fields the two electron system becomes unbound. For the near center D- system no singlet-triplet and no unbinding of the D- is found with increasing magnetic field. A magnetic field vs. donor position phase diagram is presented that depends on the width of the quantum well.

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