We report on quantum magneto-oscillations in a high mobility GaAs/AlGaAs quantum well at very high (≥ 87°) tilt angles. Unlike previous studies, we find that the spin and cyclotron splittings become equal over a continuous range of angles, but only near certain, angle-dependent filling factors. At high enough tilt angles, Shubnikov-de Haas oscillations reveal a prominent beating pattern, indicative of consecutive level crossings, all occurring at the same angle. We explain these unusual observations by an in-plane field-induced increase of the carrier mass, which leads to accelerated, filling factor-driven crossings of spin sublevels in tilted magnetic fields.
|Original language||English (US)|
|Journal||Journal of Physics: Conference Series|
|State||Published - Jan 1 2013|
|Event||20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics, HMF 2012 - Chamonix Mont Blanc, France|
Duration: Jul 22 2012 → Jul 27 2012