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Angular Momentum Transitions and Magnetic Evaporation in Off‐Center D − Centers in Quantum Well
Author(s) -
Riva C.,
Schweigert V.A.,
Peeters F.M.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199812)210:2<599::aid-pssb599>3.0.co;2-m
Subject(s) - singlet state , magnetic field , physics , condensed matter physics , center (category theory) , quantum number , electron , atomic physics , chemistry , quantum mechanics , excited state , crystallography
We investigate the effect of the position of a donor in the quantum well on the energy spectrum of the D − system in the presence of a perpendicular magnetic field. As a function of the magnetic field we find that when 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 is 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 transition and no unbinding of the D − is found with increasing magnetic field.