Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO3/SrTiO3 interface
| Autor: | A. E. M. Smink, Alexander Brinkman, Michel Goiran, B. Kerdi, Uli Zeitler, Km Rubi, Walter Escoffier, Inge Leermakers, M. Yang, Hans Hilgenkamp, Abhimanyu Rana, Jan C. Maan |
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| Přispěvatelé: | Interfaces and Correlated Electron Systems, MESA+ Institute |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Magnetoresistance FOS: Physical sciences Correlated Electron Systems / High Field Magnet Laboratory (HFML) Electron complex oxide interfaces Condensed Matter::Materials Science Effective mass (solid-state physics) Soft Condensed Matter and Nanomaterials Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Semiconductors and Nanostructures General Materials Science Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Scattering illumination Materials Science (cond-mat.mtrl-sci) Quantum oscillations Heterojunction Landau quantization magnetoconductance oscillations Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Condensed Matter::Strongly Correlated Electrons Kondo effect |
| Zdroj: | Journal of Physics Condensed Matter, 33(46):465002. IOP Publishing Ltd. Journal of Physics : Condensed Matter, 33, 1-8 Journal of Physics : Condensed Matter, 33, 46, pp. 1-8 |
| ISSN: | 1361-648X 0953-8984 |
| Popis: | We have investigated the illumination effect on the magnetotransport properties of a two-dimensional electron system at the LaAlO3/SrTiO3 interface. The illumination significantly reduces the zero-field sheet resistance, eliminates the Kondo effect at low-temperature, and switches the negative magnetoresistance into the positive one. A large increase in the density of high-mobility carriers after illumination leads to quantum oscillations in the magnetoresistance originating from the Landau quantization. The carrier density (∼2 × 1012 cm−2) and effective mass (∼1.7m e) estimated from the oscillations suggest that the high-mobility electrons occupy the d xz/yz subbands of Ti:t2g orbital extending deep within the conducting sheet of SrTiO3. Our results demonstrate that the illumination which induces additional carriers at the interface can pave the way to control the Kondo-like scattering and study the quantum transport in the complex oxide heterostructures. |
| Databáze: | OpenAIRE |
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