We utilize an inverted heterostructure grown on (311)A GaAs to realize a two-dimensional hole gas (2DHG) with a built-in back gate. The density of the 2DHG is easily and reproducibly varied between 5 × 109 and 5 × 1011 cm-2, thus achieving the lowest density of a 2DHG reported to date. The mobility of the 2DHG is highly anisotropic in the (311)A plane. We observe a cross-over from a metallic behavior at the higher densities to a localized behavior in the lower range.
|Number of pages||4|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|State||Published - 15 Jul 1998|
- Low density
- Two-dimensional hole gas