title: Longitudinal photocurrent spectroscopy of a single GaAs/AlGaAs v-groove quantum wire.
abstract: 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.
authors: Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK.
authors: N I
authors: NI
authors: Cade
authors: M
authors: M
authors: Hadjipanayi
authors: R
authors: R
authors: Roshan
authors: A C
authors: AC
authors: Maciel
authors: J F
authors: JF
authors: Ryan
authors: F
authors: F
authors: Macherey
authors: Th
authors: T
authors: Schäpers
authors: H
authors: H
authors: Lüth