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We report a computational study of coupled magnetic quantum dots, which are the magnetic analogue of the conventional electrically coupled quantum dots. In order to study that problem, we calculated the conductance of the narrow 2DEG in which two magnetic quantum dots are located. The calculated conductance shows several double anti-resonance-dips, which are due to the formation of the molecular like states which are extended over those two magnetic quantum dots. This is also shown by the local density of states which is given explicitly by the form of images. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

The control of the spherical barrier thickness or height is found to cause the dimensional transitions from the three dimensional (3D) behavior to the quasi-zero dimensional (Q0D) behavior in the density of states (DOS) and the heat capacity. When the barrier is thick enough such that the DOS shows the Q0D-like signature but is still thin enough to allow electrons to tunnel it, the temperature dependence of the heat capacity exhibits quite distinct behavior depending on the electron density. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]