T. Sogawa et al., GAAS ALAS TRENCH-BURIED QUANTUM WIRES WITH NEARLY RECTANGULAR CROSS-SECTIONS GROWN BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION ON V-GROOVED SUBSTRATES/, Applied physics letters, 64(4), 1994, pp. 472-474
GaAs trench-buried quantum wires were fabricated by using V-grooved Al
As trenches grown on V-grooved (001) substrates. These trench structur
es with vertical (110) sidewalls were formed by the faceting of (110)
planes, and lateral growth of these planes reduced the trench width to
less than 20 nm. A cross-sectional scanning electron microscope image
of these trench-buried structures showed GaAs wires about 20 nm wide
and 20 nm thick. The growth of these wires is enhanced by the capture
of Ga species into the trenches. Blueshifts and strong anisotropy of p
hotoluminescence confirm two-dimensional quantum confinement.