Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-08-31
Physica E 42, 2622 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, additional references and improved Fig. 4c, MSS-14 conference, submitted to Physica E
Scientific paper
The purpose of this work is to fabricate ribbon-like InGaAs and InAsP wires embedded in InP ridge structures and investigate their transport properties. The InP ridge structures that contain the wires are selectively grown by chemical beam epitaxy (CBE) on pre-patterned InP substrates. To optimize the growth and micro-fabrication processes for electronic transport, we explore the Ohmic contact resistance, the electron density, and the mobility as a function of the wire width using standard transport and Shubnikov-de Haas measurements. At low temperatures the ridge structures reveal reproducible mesoscopic conductance fluctuations. We also fabricate ridge structures with submicron gate electrodes that exhibit non-leaky gating and good pinch-off characteristics acceptable for device operation. Using such wrap gate electrodes, we demonstrate that the wires can be split to form quantum dots evidenced by Coulomb blockade oscillations in transport measurements.
Aers Geof C.
Granger Guillaume
Kam Alicia
Poole Philip J.
Sachrajda Andrew. S.
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