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

A. T. Hatke, M. A. Zudov, L. N. Pfeiffer, K. W. West

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16 Scopus citations

Abstract

We report on quantum magneto-oscillations in an ultrahigh 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 languageEnglish (US)
Article number241305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number24
DOIs
StatePublished - Jun 18 2012

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