Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 40, Issue 5, Pages 1563-1565Publisher
ELSEVIER
DOI: 10.1016/j.physe.2007.09.151
Keywords
magnetic semiconductors; integer quantum Hall effect; two-dimensional hole system; magnetotransport
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Mn modulation-doped strain relaxed In0.75Ga0.25As/In0.75Al0.25As single quantum-well (SQW) structures on (001)GaAs with an embedded InAs channel are fabricated by molecular beam epitaxy. The properties of the magnetic two-dimensional hole system were investigated by magnetotransport measurements up to 19 T in the temperature range from 50 mK to room temperature. In the low-temperature regime typical features of the quantum Hall effect like quantized plateaus at the Hall resistance and Shubnikov-de Haas oscillations in the longitudinal resistance are observable. The resistance at B = 0 T shows a distinct temperature dependence, and at low temperatures, a large negative magnetoresistance. Furthermore, a hysteretic behavior and jumps in the resistance below 300mK and around B = 0 T can be observed for an asymmetric QW structure. (C) 2007 Elsevier B.V. All rights reserved.
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