Electric field controlled g-factor in parabolic well determined by transport measurements

The Shubnikov de Haas oscillations in 500Å parabolic well are studied in the tilted magnetic field. The electric field displaces the electron wave function along Z-axis and leads to the strong variation of the average bare g-factor in such system. From the measurements of the filling factor νc at which the spin gap collapse occurs, we deduce the total Zeeman energy, which consists of the bare Zeeman energy and exchange-correlation term. By investigating of the variation of νc in tilted field we reliably extract the bare g-factor as a function of the gate voltage.