Undoped Electron-Hole Bilayers in a GaAs/AlGaAs Double Quantum Well

Details Undoped Electron-Hole Bilayers in a GaAs/AlGaAs Double Quantum Well Undoped Electron-Hole Bilayers in a GaAs/AlGaAs Double Quantum Well

2006-11-08

arxiv.org/abs/cond-mat/0611220v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

10.1063/1.2437664

We present the fabrication details of completely undoped electron-hole bilayer devices in a GaAs/AlGaAs double quantum well heterostructure with a 30 nm barrier. These devices have independently tunable densities of the two-dimensional electron gas and two-dimensional hole gas. We report four-terminal transport measurements of the independently contacted electron and hole layers with balanced densities from $1.2 \times 10^{11}$cm$^{-2}$ down to $4 \times 10^{10}$ cm$^{-2}$ at $T = 300 mK$. The mobilities can exceed $1 \times 10^{6}$ cm$^{2}$ V$^{-1}$ s$^{-1}$ for electrons and $4 \times 10^{5}$ cm$^{2}$ V$^{-1}$ s$^{-1}$ for holes.

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