標題: Enhanced Absorption Due to Formation of Quasi-Bound States in Type-II Coupled Quantum Rings
作者: Hsieh, Chi-Ti
Lin, Shih-Yen
Chang, Shu-Wei
光電工程學系
Department of Photonics
關鍵字: Absorption;type-II quantum ring;quasi-bound state;tunneling
公開日期: 1-Mar-2018
摘要: The absorption of type-II nanostructures is often weaker than type-I counterpart due to spatially indirect optical transitions. This phenomenon limits the application of type-II nanostructures in photon detections. In this paper, we show that with proper arrangements of conduction barriers, the formation of quasi-bound states can significantly boost up the absorption of type-II coupled quantum rings. Meanwhile, the rapid tunneling of electrons in these leaky states should make the corresponding external quantum efficiency comparable to that of single (uncoupled) rings. These featuresmay improve the performance of photon detectors based on type-II semiconductor nanostructures.
URI: http://dx.doi.org/10.1109/JSTQE.2017.2736438
http://hdl.handle.net/11536/146014
ISSN: 1077-260X
DOI: 10.1109/JSTQE.2017.2736438
期刊: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume: 24
Appears in Collections:Articles