Longitudinal photocurrent spectroscopy of a single GaAs/AlGaAs v-groove quantum wire

Details Longitudinal photocurrent spectroscopy of a single GaAs/AlGaAs v-groove quantum wire Longitudinal photocurrent spectroscopy of a single GaAs/AlGaAs v-groove quantum wire

2006-04-03

arxiv.org/abs/cond-mat/0604032v1

Nanotechnology 16, 307 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1088/0957-4484/16/2/023

Modulation-doped GaAs v-groove quantum wires (QWRs) have been fabricated with novel electrical contacts made to two-dimensional electron-gas (2DEG) reservoirs. Here, we present longitudinal photocurrent (photoconductivity/PC) spectroscopy measurements of a single QWR. We clearly observe conductance in the ground-state one-dimensional subbands; in addition, a highly temperature-dependent response is seen from other structures within the v-groove. The latter phenomenon is attributed to the effects of structural topography and localization on carrier relaxation. The results of power-dependent PC measurements suggest that the QWR behaves as a series of weakly interacting localized states, at low temperatures.

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