標題: | Single-exciton energy shell structure in InAs/GaAs quantum dots |
作者: | Awirothananon, S. Raymond, S. Studenikin, S. Vachon, M. Render, W. Sachrajda, A. Wu, X. Babinski, A. Potemski, M. Fafard, S. Cheng, S. J. Korkusinski, M. Hawrylak, P. 電子物理學系 Department of Electrophysics |
關鍵字: | bound states;exchange interactions (electron);excited states;excitons;gallium arsenide;III-V semiconductors;indium compounds;magneto-optical effects;photoluminescence;semiconductor quantum dots;spectral line shift |
公開日期: | 1-十二月-2008 |
摘要: | The energy shell structure of a single exciton confined in a self-assembled quantum dot (QD), including excited states, is studied in a regime where the direct Coulomb attraction energy is comparable to the kinetic energy of the carriers. This is achieved via magnetophotoluminescence excitation spectroscopy experiments, where a magnetic field applied perpendicular to the plane of the QD is used to reveal the angular-momentum content of energy shells. The absorption spectrum of the QDs is modeled, and comparison with experiment allows us to relate the observed transitions to interband QD bound-state transitions. The blueshift of the absorption peaks compared to the emission peaks is then interpreted in terms of many-body interactions, and we show that for a highly symmetric situation, the observed energy difference gives a direct measurement of the extra exchange energy gained upon addition of an extra exciton in the QD. |
URI: | http://dx.doi.org/10.1103/PhysRevB.78.235313 http://hdl.handle.net/11536/8058 |
ISSN: | 1098-0121 |
DOI: | 10.1103/PhysRevB.78.235313 |
期刊: | PHYSICAL REVIEW B |
Volume: | 78 |
Issue: | 23 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |