Spectroscopy on single columns of vertically aligned InAs quantum dots |
| |
Authors: | T. Nakaoka J. Tatebayashi Y. Arakawa |
| |
Affiliation: | a Research, Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;b Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan |
| |
Abstract: | We have investigated the carrier relaxation dynamics in single columns of tenfold stacked vertically aligned InAs quantum dots by micro-photoluminescence measurement. The excitation spectrum in the stacked dots is much different from that in the single dot characterized by the existence of a zero-absorption region and sharp multiple phonon emission lines. We have observed a broad continuum absorption far below the wetting layer band edge in the spectrum of the single columns although we have confirmed the existence of a zero-absorption region in the same sample with reduced number of dot layers to almost single, realized by surface etching. The broad absorption feature suggests the existence of additional carrier relaxation channels through non-resonant tunneling between the dots. |
| |
Keywords: | Author Keywords: Quantum dots Photoluminescence Carrier relaxation |
本文献已被 ScienceDirect 等数据库收录! |
|