Low-temperature capacitance-voltage measurements in an electron system realized in a remotely doped, wide AlGaAs parabolic quantum well show small (∼1%) capacitance steps whose positions coincide with the calculated and independently measured front gate voltages at which the electric subbands are depopulated. The step positions respond to an applied in-plane magnetic field or a back-gate bias, in a manner consistent with the magnetic or electric depopulation of the subbands, respectively. We conclude that these steps are indeed related to the subband structure of the electron system.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics