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

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 h...

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Published inJournal of physics. Conference series Vol. 456; no. 1; pp. 12041 - 5
Main Authors Hatke, A T, Zudov, M A, Pfeiffer, L N, West, K W
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 05.08.2013
Subjects
Aluminum gallium arsenides
Attitude (inclination)
Camber
Cyclotrons
Gallium arsenide
Gallium arsenides
Level crossings
Magnetic fields
Oscillations
Physics
Quantum wells
Tilt
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Summary: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.
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/456/1/012041