Abstract
We performed a theoretical analysis of the Aharonov-Bohm oscillations of the ground-state energy of quasi-one-dimensional quantum rings in a magnetic field, recently observed in conductance experiments, by means of quantum Monte Carlo calculations. The model rings considered contain and electrons, with radii of 20 and 120 nm, respectively. These parameters give a close description of the nanorings analyzed in the experiments. In particular, the two cases well reproduce the high- and low-electron-density regimes. For we have found fractional Aharonov-Bohm effect with a period due to the changes in the total spin of the ground state. For we have found fractional oscillations with a period which are shown to be a consequence of strong localization.
- Received 9 June 2003
DOI:https://doi.org/10.1103/PhysRevB.68.115312
©2003 American Physical Society