title: Intrinsic radiative lifetime derived via absorption cross section of one-dimensional excitons.
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 nm(2) 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.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan. shaoqiangchen@gmail.com
authors.forename: Shaoqiang
authors.initials: S
authors.lastname: Chen
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshita
authors.forename: Akira
authors.initials: A
authors.lastname: Ishikawa
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Mochizuki
authors.forename: Shun
authors.initials: S
authors.lastname: Maruyama
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Akiyama
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Hayamizu
authors.forename: Loren N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: Ken W
authors.initials: KW
authors.lastname: West
mesh_terms: D000042:Absorption; D004583:Electrons; D008163:Luminescent Measurements; D046529:Microscopy, Electron, Transmission; D055095:Optics and Photonics; D045663:Quantum Dots; D012542:Scattering, Radiation; D013499:Surface Properties; D013696:Temperature