Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO3/SrTiO3interface

I. Leermakers, K. Rubi*, M. Yang, B. Kerdi, M. Goiran, W. Escoffier, A.S. Rana, A.E.M. Smink, A. Brinkman, H. Hilgenkamp, J. C. Maan, U. Zeitler

*Corresponding author for this work

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Abstract

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.

Original languageEnglish
Article number465002
JournalJournal of Physics Condensed Matter
Volume33
Issue number46
Early online date8 Sep 2021
DOIs
Publication statusPublished - 17 Nov 2021

Keywords

  • complex oxide interfaces
  • illumination
  • magnetoconductance oscillations

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