New Shubnikovde Haas effects in a two-dimensional electron-hole system

We report the temperature dependence of the Shubnikovde Haas oscillations from a two-dimensional electron-hole system in GaSb-InAs-GaSb quantum wells at very low temperatures. The samples are double heterostructures containing separate electron and hole layers. The oscillations arising from the electron layer behave regularly with temperature. Additional oscillations, characterized by strong temperature dependence, and relatively large peak widths are believed to arise from the presence of hole layers. © 1985 The American Physical Society.