ABSTRACT
Acknowledgement This work has been supported in part by Korean Science and Engineering Foundation (Grant R01-2000-00037) and in part by the Ministry of Commerce, Industry and Energy in 2001.
V. Donchev\ M. Saraydarov\ K. Germanova', Xue-Lun Wang 2.J, SeongJin Kim 4, Mutsuo Ogura 2.J 'Faculty of Physics, Sofia University, 5. blvd. J.Bourchier, 1164 Sofia, Bulgaria 2Photonics Research Institute, National Institute of Advanced Industrial Science andTechnology (AIST), Tsukuba Central 2, Tsukuba 305-8568, Japan 'CREST, Japan Science and Technology Corporation (JST), 4-1-8 Honcho, Kawaguchi 332-0012, Japan 4Electronics and Telecommunications Research Institute (ETRI), 161Kajong-Dong, Yusong-Gu, Taejon 305-350, South Korea
Abstract. A new photoconductivity (PC) study of undoped GaAs/ AlGaAs quantum wires (QWRs) is carried out measuring the PC along the wires direction. The PC spectrum reveals several peak structures, related to the QWRs. This suggestion is confirmed by the observed dependence of the spectrum on the exciting light polarisation and by photoluminescence and photoluminescence excitation measurements on a similar sample. A long pre-illumination of the sample with infrared light (hv = 1.18 eV) is found to reduce considerably the substrate related background in the PC spectrum, which makes the QWR structures better prnounced.
