標題: | Electron energy state spin-splitting in 3D cylindrical semiconductor quantum dots |
作者: | Li, Y Voskoboynikov Lee, CP Sze, SM Tretyak, O 電子工程學系及電子研究所 電子與資訊研究中心 Department of Electronics Engineering and Institute of Electronics Microelectronics and Information Systems Research Center |
公開日期: | 1-八月-2002 |
摘要: | In this article we study the impact of the spin-orbit interaction on the electron quantum confinement for narrow gap semiconductor quantum dots. The model formulation includes: (1) the effective one-band Hamiltonian approximation; (2) the position- and energy-dependent quasi-particle effective mass approximation; (3) the finite hard wall confinement potential; and (4) the spin-dependent Ben Daniel-Duke boundary conditions. The Hartree-Fock approximation is also utilized for evaluating the characteristics of a two-electron quantum dot system. In our calculation, we describe the spin-orbit interaction which comes from both the spin-dependent boundary conditions and the Rashba term (for two-electron quantum dot system). It can significantly modify the electron energy spectrum for InAs semiconductor quantum dots built in the GaAs matrix. The energy state spin-splitting is strongly dependent on the dot size and reaches an experimentally measurable magnitude for relatively small dots. In addition, we have found the Coulomb interaction and the spin-splitting are suppressed in quantum dots with small height. |
URI: | http://dx.doi.org/10.1140/epjb/e2002-00250-6 http://hdl.handle.net/11536/28614 |
ISSN: | 1434-6028 |
DOI: | 10.1140/epjb/e2002-00250-6 |
期刊: | EUROPEAN PHYSICAL JOURNAL B |
Volume: | 28 |
Issue: | 4 |
起始頁: | 475 |
結束頁: | 481 |
顯示於類別: | 期刊論文 |