標題: Impacts of Coulomb Interactions on the Magnetic Responses of Excitonic Complexes in Single Semiconductor Nanostructures
作者: Chang, Wen-Hao
Lin, Chia-Hsien
Fu, Ying-Jhe
Lin, Ta-Chun
Lin, Hsuan
Cheng, Shuen-Jen
Lin, Sheng-Di
Lee, Chien-Ping
電子物理學系
Department of Electrophysics
關鍵字: Quantum dots;Quantum rings;Magnetophotoluminescence;Diamagnetic shift
公開日期: 1-四月-2010
摘要: We report on the diamagnetic responses of different exciton complexes in single InAs/GaAs self-assembled quantum dots (QDs) and quantum rings (QRs). For QDs, the imbalanced magnetic responses of inter-particle Coulomb interactions play a crucial role in the diamagnetic shifts of excitons (X), biexcitons (XX), and positive trions (X (-) ). For negative trions (X (-) ) in QDs, anomalous magnetic responses are observed, which cannot be described by the conventional quadratic energy shift with the magnetic field. The anomalous behavior is attributed to the apparent change in the electron wave function extent after photon emission due to the strong Coulomb attraction by the hole in its initial state. In QRs, the diamagnetic responses of X and XX also show different behaviors. Unlike QDs, the diamagnetic shift of XX in QRs is considerably larger than that of X. The inherent structural asymmetry combined with the inter-particle Coulomb interactions makes the wave function distribution of XX very different from that of X in QRs. Our results suggest that the phase coherence of XX in QRs may survive from the wave function localization due to the structural asymmetry or imperfections.
URI: http://dx.doi.org/10.1007/s11671-010-9531-3
http://hdl.handle.net/11536/5554
ISSN: 1931-7573
DOI: 10.1007/s11671-010-9531-3
期刊: NANOSCALE RESEARCH LETTERS
Volume: 5
Issue: 4
起始頁: 680
結束頁: 685
顯示於類別:期刊論文


文件中的檔案:

  1. 000276435500002.pdf