Abstract
The electron tunneling in double quantum dot (DQD) is studied by changing of inter-dot distance. Localization of an electron is calculated for each level of the whole spectrum of the confinement states of DQD. For identical QDs the tunneling goes consecutively from high energy levels to the ground state. It is changed essentially when the QDs of the system are non-identical. We show that violation of symmetry of the DQD geometry makes it difficult for the tunneling. For double quantum ring (DQR) we demonstrate that the electron states with the same type of rotation symmetry play an important role for tunneling.
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