Shubnikov-de Haas oscillations in high mobility GaAs quantum wells in tilted magnetic fields

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Hatke, A.T.^1 ; Zudov, M.A.^1 ; Pfeiffer, L.N.^2 ; West, K.W.^2

School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, United States^1

Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States^2

关键词: Angle-dependent;    GaAs quantum wells;    GaAs/AlGaAs quantum well;    In-plane fields;    Level crossing;    Magneto-oscillation;    Shubnikov de-Haas oscillation;    Tilted magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012041/pdf
DOI  :  10.1088/1742-6596/456/1/012041

来源: IOP

【 摘 要 】

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.