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Magneto-optical confirmation of Landau level splitting in a GaN/AlGaN 2DEG grown on bulk GaN

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Wirth,  Steffen
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Schmult, S., Solovyev, V. V., Wirth, S., Großer, A., Mikolajick, T., & Kukushkin, I. V. (2019). Magneto-optical confirmation of Landau level splitting in a GaN/AlGaN 2DEG grown on bulk GaN. Journal of Vacuum Science and Technology B, 37(2): 021210, pp. 1-5. doi:10.1116/1.5088927.


Cite as: http://hdl.handle.net/21.11116/0000-0003-63B8-E
Abstract
Landau level splitting in a two-dimensional electron gas (2DEG) confined in an ultrapure GaN/AlGaN heterostructure grown by molecular beam epitaxy on bulk GaN is verified spectroscopically. The Landau level fan reconstructed from magneto-photoluminescence (PL) data yields an effective mass of 0.24m(0) for the 2D electrons. Narrow excitonic PL line widths < 100 mu eV, an atomically flat surface of the layer stack, as well as the absence of the 2DEG in the dark environment, are important ancillary experimental findings while focusing on magneto-PL investigations of the heterostructure. Simultaneously recorded Shubnikov-de Haas and magneto-PL intensity oscillations under steady UV illumination exhibit an identical frequency and allow for two independent ways of determining the 2D density. Published by the AVS.