Ring-shaped spatial pattern of exciton luminescence formed due to the hot carrier transport in a locally photoexcited electron-hole bilayer

Autor:	Paraskevov, A. V.
Rok vydání:	2011
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Nonlinear Sciences - Pattern Formation and Solitons
Zdroj:	J. Exp. Theor. Phys. 114, 1022 (2012)
Druh dokumentu:	Working Paper
DOI:	10.1134/S1063776112040139
Popis:	A consistent explanation of the formation of a ring-shaped pattern of exciton luminescence in GaAs/AlGaAs double quantum wells is suggested. The pattern consists of two concentric rings around the laser excitation spot. It is shown that the luminescence rings appear due to the in-layer transport of hot charge carriers at high photoexcitation intensity. Interestingly, one of two causes of this transport might involve self-organized criticality (SOC) that would be the first case of the SOC observation in semiconductor physics. We test this cause in a many-body numerical model by performing extensive molecular dynamics simulations. The results show good agreement with experiments. Moreover, the simulations have enabled us to identify the particular kinetic processes underlying the formation of each of these two luminescence rings. Comment: 14 pages, 16 figures. Final version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1104.1694 Zobrazit plný text záznamu View this record from Arxiv