| Title | Excitonic localization at macrostep edges in AlGaN/AlGaN multiple quantum wells |
| Authors | Hou, Mengjun Qin, Zhixin Zhang, Lisheng Han, Tianyang Wang, Mingxing Xu, Fujun Wang, Xinqiang Yu, Tongjun Fang, Zheyu Shen, Bo |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Artificial Microstruct & Mesoscop P, Beijing 100871, Peoples R China. Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China. |
| Keywords | AlGaN Macrostep edge Quantum wires ALN/SAPPHIRE TEMPLATES CARRIER CAPTURE QUALITY WIRES LUMINESCENCE DIODES ALGAN |
| Issue Date | 2017 |
| Publisher | SUPERLATTICES AND MICROSTRUCTURES |
| Citation | SUPERLATTICES AND MICROSTRUCTURES.2017,104,397-401. |
| Abstract | Double peaks at wavelength of 276 and 290 nm are observed for AlGaN/AlGaN multiple quantum wells (MQWs). Cathodoluminescence (CL) mappings identify that the emission at 290 nm originates from the macrostep edges. Potential minima induced by local variation of QW thickness and Ga incorporation are found along the step edges, where quantum wires (QWRs) are formed. The lateral advance rate of macrostep (similar to 310 nm/h) is obtained by investigating the distribution of QWRs. Temperature-dependent CL spectrum suggest that thermal quenching for 290 nm emission is dramatically suppressed compared with that for conventional QWs emission, which shows excitonic localization characteristics of QWRs. (C) 2017 Published by Elsevier Ltd. |
| URI | http://hdl.handle.net/20.500.11897/474218 |
| ISSN | 0749-6036 |
| DOI | 10.1016/j.spmi.2017.02.051 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 |
