Energy structure and magnetization effect of semiconductor quantum rings

Yi-Ming Li, Hsiao Mei Lu, O. Voskoboynikov, C. P. Lee, S. M. Sze

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In this paper, we study the electronic structure of InAs/GaAs quantum rings and dots under applied magnetic fields. To compute electron-hole energy states and magnetization, a realistic three-dimensional (3D) model is applied and is solved with the nonlinear iterative method. With the developed nanostructure simulator, the variation of energy states for semiconductor quantum rings (Rin=10 nm) changing into dots (Rin=0 nm) are investigated comprehensively. For a fixed ring height and width, we have found the energy band gap of rings are strongly dependent on ring (and dot) shapes, ring inner radii, and applied magnetic fields. Due to the magnetic field penetration into the ring region, the variation of electron-hole energy states and magnetization of InAs/Gas rings saturate and oscillate nonperiodically when the magnetic field increases. Our observation in the oscillation of electron-hole energy states is contrary to conventional periodical argument. The results presented here provide an alternative in studying optical spectra and magneto-optical property of semiconductor quantum rings and are useful for real device applications.

Original languageEnglish
Title of host publicationProceedings of the 2002 2nd IEEE Conference on Nanotechnology, IEEE-NANO 2002
PublisherIEEE Computer Society
Number of pages4
ISBN (Electronic)0780375386
StatePublished - 2002
Event2nd IEEE Conference on Nanotechnology, IEEE-NANO 2002 - Washington, United States
Duration: 26 Aug 200228 Aug 2002

Publication series

NameProceedings of the IEEE Conference on Nanotechnology
ISSN (Print)1944-9399
ISSN (Electronic)1944-9380


Conference2nd IEEE Conference on Nanotechnology, IEEE-NANO 2002
CountryUnited States


  • Computational modeling
  • Energy states
  • Gallium arsenide
  • Iterative methods
  • Magnetic fields
  • Magnetization
  • Nonlinear optics
  • Photonic band gap
  • Quantum dots
  • Shape

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