ABSTRACT
In the last decade there has been extensive experimental work on man-made semiconductor quantum dots (QD). Existence of shell structure, demonstration of Hund’s rule, and the ability to control the number of electrons in both the single and the double QDs have prompted proposals on building various devices based on electron spins and charge states. This chapter describes the TQD structure and the computational approach used to solve the many-body Schrödinger equation. It provides results of the simulations for the TQD structure and analyzes the effect of adding deformation, applying an external magnetic field, and changing the relative positions of the QDs. The abrupt variation in the exchange energy in TQDs and its dependence on magnetic fields is novel for artificial systems and, as such, it is of central importance for the manipulation of spin qubits in coupled QDs as quantum gates for quantum information processing.
