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- Title
- Aharonov-Bohm effect of excitons in nanorings
- Author(s)
- Hu, Hui; Zhu, Jia-Lin; Li, Dai-Jun; Xiong, Jia-Jiong
- Abstract
- The magnetic field effects on excitons in an InAs nanoring are studied theoretically. By numerically diagonalizing the effective-mass Hamiltonian of the problem that can be separated into terms in center-of-mass and relative coordinates, we calculate the low-lying excitonic energy levels and oscillator strengths as a function of the ring width and the strength of an external magnetic field. It is shown that in the presence of Coulomb correlation, the so-called Aharonov-Bohm effect of excitons exists in a finite (but small) width nanoring. However, when the ring width becomes large, the non-simply-connected geometry of nanorings is destroyed, causing the suppression of the Aharonov-Bohm effect. The analytical results are obtained for a narrow-width nanoring in which the radial motion is the fastest one and adiabatically decoupled from the azimuthal motions. The conditional probability distribution calculated for the low-lying excitonic states allows identification of the presence of the Aharonov-Bohm effect. The linear optical susceptibility is also calculated as a function of the magnetic field, to be compared with the future measurements of optical emission experiments on InAs nanorings.
- Publication type
- Journal article
- Source
- Physical Review B: Condensed Matter and Material Physics, Vol. 63, no. 19 (May 2001), article no. 195307
- Publication year
- 2001
- FOR Code(s)
- 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
- Keyword(s)
- Aharonov-Bohm effect; Nanorings
- Publisher
- American Physical Society
- ISSN
- 1098-0121
- Publisher URL
- http://dx.doi.org/10.1103/PhysRevB.63.195307
- Copyright
- Copyright © 2001 The American Physical Society. The accepted manuscript of the paper is reproduced here in accordance with the copyright policy of the publisher for noncommercial use only.
- Full text
- Peer reviewed
