Effects of geometry and impurities on quantum rings in magnetic fields
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||8|
|Journal||Physical Review B|
|Publication status||Published - May 2006|
|Publication type||A1 Journal article-refereed|
We investigate the effects of impurities and changing ring geometry on the energetics of quantum rings under different magnetic field strengths. We show that as the magnetic field and/or the electron number are/is increased, both the quasiperiodic Aharonov-Bohm oscillations and various magnetic phases become insensitive to whether the ring is circular or square in shape. This is in qualitative agreement with experiments. However, we also find that the Aharonov-Bohm oscillation can be greatly phase shifted by only a few impurities and can be completely obliterated by a high level of impurity density. In the many-electron calculations we use a recently developed fourth-order imaginary time projection algorithm that can exactly compute the density matrix of a free electron in a uniform magnetic field.
- MAXIMUM-DENSITY-DROPLET, BLOCKADE PEAK SPACINGS, DOTS, STATISTICS, EQUATIONS, ENERGY