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- Title
Intrinsic radiative lifetime derived via absorption cross section of one-dimensional excitons.
- Authors
Shaoqiang Chen; Masahiro Yoshita; Akira Ishikawa; Toshimitsu Mochizuki; Shun Maruyama; Hidefumi Akiyama; Yuhei Hayamizu; Pfeiffer, Loren N.; West, Ken W.
- Abstract
Intrinsic radiative lifetime is an essential physical property of low-dimensional excitons that represents their optical transition rate and wavefunction, which directly measures the probability of finding an electron and a hole at the same position in an exciton. However, the conventional method that is used to determine this property via measuring the temperature-dependent photoluminescence (PL) decay time involves uncertainty due to various extrinsic contributions at high temperatures. Here, we propose an alternative method to derive the intrinsic radiative lifetime via temperature-independent measurement of the absorption cross section and transformation using Einstein's A-B-coefficient equations derived for low-dimensional excitons. We experimentally verified our approach for one-dimensional (1D) excitons in high-quality 14 × 6 nm2 quantum wires by comparing it to the conventional approach. Both independent evaluations showed good agreement with each other and with theoretical predictions. This approach opens a promising path to studying low-dimensional exciton physics.
- Subjects
RADIATIVE lifetime; EXCITON theory; WAVE functions; PHOTOLUMINESCENCE; HIGH temperatures
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep01941