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InGaAs/GaAsSb based two-dimensional electron gases
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The authors report on two-dimensional electron gases realized in the In0.53Ga0.47As/GaAs0.51Sb0.49 material system. For different doping levels, the sheet carrier densities were measured to be between 8.4. × 1010 and 8.3 × 1011 cm−2. A maximum electron mobility of 42 700 cm2/V s was observed at a temperature of 60 K. In addition to alloy scattering, remote ionized impurity scattering is a limiting factor for this material combination, as the GaAs 0.51Sb0.49 barriers have the same low effective mass as the In0.53Ga0.47As channel and therefore allow the wavefunction to protrude into the barrier more than in other established material systems. Angle resolved Hall measurements revealed a strong influence of the crystallographic directions on the carrier mobility and two-dimensional electron population. An additional feature of these two-dimensional electron systems, originating from the fact that In0.53Ga0.47As and GaAs 0.51Sb0.49 show a type-II band alignment and comparable bandgap energies, is spin splitting, due to the Rashba effect, with a Rashba-parameter of 0.42 eVÅ.
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