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

Abstract

We report on quantum magneto-oscillations in an ultra-high mobility GaAs/AlGaAs quantum well at very high 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.

References in corpus (7)

• Two - Dimensional Electron Liquid in a Weak Magnetic Field
• Collapse of Spin-Splitting in the Quantum Hall Effect
• Critical Collapse of the Exchange Enhanced Spin Splitting in 2-D Systems
• In-Plane Magnetic Field Induced Anisotropy of 2D Fermi Contours and the Field Dependent Cyclotron Mass
• The quantum Hall ferromagnet at high filling factors: A magnetic field induced Stoner transition
• Cyclotron effective mass of 2D electron layer at GaAs/AlGaAs heterojunction subject to in-plane magnetic fields
• Influence of the single-particle Zeeman energy on the quantum Hall ferromagnet at high filling factors

Cited by in corpus (12)

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• Transport anisotropy in Ge quantum wells in the absence of quantum oscillations
• In-plane magnetic field effect on hole cyclotron mass and $g_z$ factor in high-mobility SiGe/Ge/SiGe structures
• Two-dimensional electron gas tilt-induced Landau level crossings
• Commensurability oscillations in a quasi-two-dimensional electron gas subjected to strong in-plane magnetic field
• Efficient method to calculate energy spectra for analysing magneto-oscillations
• Giant Shubnikov-de Haas Oscillations with V-Shaped Minima in a High-Mobility Two-Dimensional Electron Gas: Experiment and Phenomenological Model