Electron Transition between Weakly Coupled Concentric Quantum Rings

摘要

We investigate the electron wavefunction localization in double concentric quantum rings when a perpendicular magentic field is applied. In weakly coupled double quantum ring (DCQR), it is possible the situation, when the single electron energy levels associated with different rings may crossed. To avoid degenarasy, the anticrossing of these levels has a place. We show that in this DCQR the electron spatial transition between the rings can occurr due to the electron level anti-crossing. The anti-crossing of the levels with different radial quantum numbers provides the conditions when the electron tunneling between rings becomes possible. To study electronic structure of the semiconductor DCQR, the single sub-band effective mass approach was used. Results of numerical simulation for the electron transition are presented for DCQRs of different geometry.