Optical detection of 2DEG in GaN/AlGaN structures - High magnetic field studies

被引：0

作者：

Chwalisz, B ^{[1
]}

Wysmolek, A ^{[1
]}

Stepniewski, R ^{[1
]}

Potemski, M ^{[1
]}

Knap, W ^{[1
]}

Baranowski, JM ^{[1
]}

Grandjean, N ^{[1
]}

Massies, J ^{[1
]}

Prystawko, P ^{[1
]}

Grzegory, I ^{[1
]}

机构：

[1] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland

来源：

E-MRS 2003 FALL MEETING, SYMPOSIA A AND C, PROCEEDINGS | 2004年 / 1卷 / 02期

关键词：

D O I：

10.1002/pssc.200303937

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magneto-photoluminescence (PL) studies up to 28T of the GaN/AlGaN structure are presented. PL spectra in the energy range below the excitonic bulk transitions show periodic energy and line width oscillations what is interpreted as a fingerprint of two dimensional electron gas confined at GaN/AlGaN interface. Observed oscillations are a direct consequence of Landau quantization and known as optical Shubnikov de Haas Effect if related to the Fermi level oscillations. This observation allows us to determine the electron concentration to 3(.)10(12) cm(-2). Appearance of the oscillations is discussed in terms of magnetic field induced potential redistribution in the structure and theory including many-body effects. Surprisingly, it was observed that magneto-PL intensity oscillates also in other energy regions of the spectra. It was found that this emission originates from the second electric energy level and the oscillations are a direct consequence of the interaction with the first electronic subband Landau levels. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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页码：193 / 197

页数：5

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