GaN/AlGaN 2DEGs in the quantum regime: Magneto-transport and photoluminescence to 60 tesla
| Autor: | Debdeep Jena, Brad Ramshaw, YongJin Cho, You Lai, I. Zimmermann, Scott A. Crooker, Laurel Winter, M. Lee, J. L. Doorn, Huili Grace Xing, Y. Ren, R. D. McDonald |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Photoluminescence Materials science Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Condensed matter physics Quantum limit Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Macroscopic quantum phenomena Quantum oscillations Heterojunction 02 engineering and technology Landau quantization Electron Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 0210 nano-technology |
| Zdroj: | Applied Physics Letters. 117:262105 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Using high magnetic fields up to 60 T, we report magneto-transport and photoluminescence (PL) studies of a two-dimensional electron gas (2DEG) in a GaN/AlGaN heterojunction grown by molecular-beam epitaxy. Transport measurements demonstrate that the quantum limit can be exceeded (Landau level filling factor $\nu < 1$), and show evidence for the $\nu =2/3$ fractional quantum Hall state. Simultaneous optical and transport measurements reveal synchronous quantum oscillations of both the PL intensity and longitudinal resistivity in the integer quantum Hall regime. PL spectra directly reveal the dispersion of occupied Landau levels in the 2DEG and therefore the electron mass. These results demonstrate the utility of high (pulsed) magnetic fields for detailed measurements of quantum phenomena in high-density 2DEGs. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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