Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-04-25
Semicond. Sci. Technol. 17 (2002) 947-951.
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages (incl.7 figures); pdf file; submitted to Semicond. Sci. Technol
Scientific paper
10.1088/0268-1242/17/9/308
We have investigated the optical and transport properties of MBE grown short-period superlattices of InAs/GaAs with different numbers of periods (3 <= N <= 24) and a total thickness 14 nm. Bandstructure calculations show that these superlattices represent a quantum well with average composition In_0.16Ga_0.84As. The electron wave functions are only slightly modulated by the superlattice potential as compared to a single quantum well with the same composition, which was grown as a reference sample. The photoluminescence, the resistance, the Shubnikov-de Haas effect and the Hall effect have been measured as a function of the InAs layer thickness Q in the range 0.33 <= Q <= 2.7 monolayers (ML). The electron densities range from 6.8 to 11.5x10^11 cm^-2 for Q <= 2.0 ML. The photoluminescence and magnetotransport data show that only one subband is occupied. When Q >= 2.7 ML quantum dots are formed and the metallic type of conductivity changes to variable range hopping conductivity.
Fedorov Yu. V.
Khabarov Yu. V.
Kulbachinskii V. A.
Lunin R. A.
Mokerov V. G.
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