| Issue |
EPL
Volume 104, Number 6, December 2013
|
|
|---|---|---|
| Article Number | 67004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/104/67004 | |
| Published online | 14 January 2014 | |
Suppression of the Aharonov-Bohm effect in hexagonal quantum rings
1 Departament de Química Física i Analítica, Universitat Jaume I - Castelló de la Plana, Spain
2 Institute for Nanoscience, CNR NANO S3 - I-41125 Modena, Italy
Received: 18 September 2013
Accepted: 16 December 2013
Few-electron states of AlAs-GaAs-AlAs hexagonal quantum rings pierced by an axial magnetic field are computed through full configuration interaction calculations. The quantum ring is in the low-density regime, populated with N = 1 up to N = 7 electrons. Similar to circular rings, the energy spectra of the hexagonal ones reflect an integer and fractional Aharonov-Bohm regular oscillation pattern for N = 1 and 
, respectively. Deviations from the regular fractional period with increasing electron density become apparent for larger N. Remarkably, for N = 6 the Aharonov-Bohm effect is completely suppressed. This is a unique symmetry-related feature of hexagonal rings that only can emerge in the low-density regime.
PACS: 75.75.-c – Magnetic properties of nanostructures / 73.21.Hb – Quantum wires / 73.21.La – Quantum dots
© EPLA, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.