Browsing by Author "Makarovsky, O."
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Item Open Access Large zero-field spin splitting in AlGaN/AlN/GaN/AlN heterostructures(AIP Publishing LLC, 2009) Lisesivdin, S. B.; Balkan, N.; Makarovsky, O.; Patanè, A.; Yildiz, A.; Caliskan, M. D.; Kasap, M.; Ozcelik, S.; Özbay, EkmelThis work describes Shubnikov-de Haas (SdH) measurements in Al0.22 Ga0.78 N/AlN/GaN/AlN heterostructures. Our experiments coupled with the analysis of the Hall data at various temperatures confirm the formation of a two-dimensional electron gas (2DEG) at the AlN/GaN interface. A beating pattern in the SdH oscillations is also observed and attributed to a zero-field spin splitting of the 2DEG first energy subband. The values of the effective spin-orbit coupling parameter and zero-field spin-split energy are estimated and compared with those reported in the literature. We show that zero-field spin-split energy tends to increase with increasing sheet electron density and that our value (12.75 meV) is the largest one reported in the literature for GaN-based heterostructures.