Aharonov – Bohm oscillations in concentric quantum ring systems
Pages 30-36
Zs. Szakacs, D. Racolta
Abstract
We consider a system of concentric rings with a variable M number of sites in each ring. The influence of the magnetic field is also taken into account. The system is described using the attractive Hubbard Hamiltonian for electron-hole pairs. We study the evolution of Aharonov-Bohm oscillations when rings are added. The case of the small distance between rings can be approximated with the continuum case. When the distance between the rings is large enough, we can find that the AB oscillations decrease very rapidly once we increase the circumference of the ring.