2009/06/30 by Pavel A. Frantsuzov, Sandor Volkan-Kacso, Sándor Volkán-Kacsó +2
Engineering · Materials Science · Physics and Astronomy · #Chalcogenide Semiconductor Thin Films #Near-Field Optical Microscopy #Quantum Dots Synthesis And Properties #cond-mat.mes-hall #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevlett.103.207402
published as Phys. Rev. Lett. 103, 207402 (2009) · 4 pages, 2 figures
openalex publication_date 2009/11/11 · arxiv created 2009/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a new physical model resolving a long-standing mystery of the power-law distributions of the blinking times in single colloidal quantum dot fluorescence. The model considers the nonradiative relaxation of the exciton through multiple recombination centers. Each center is allowed to switch between two quasistationary states. We point out that the conventional threshold analysis method used to extract the exponents of the distributions for the on times and off times has a serious flaw: the qualitative properties of the distributions strongly depend on the threshold value chosen for separating the on and off states. Our new model explains naturally this threshold dependence, as well as other key experimental features of the single quantum dot fluorescence trajectories, such as the power-law power spectrum (1/f noise).