Journal
NPJ QUANTUM MATERIALS
Volume 5, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41535-020-0210-z
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Funding
- grant NEXT [ANR-10-LABX-0037]
- LNCMI-CNRS
- NUS Academic Research Fund (AcRF Tier 1) [R-144-000-364-112, R-144-000-391-114, R-144-000-403-114]
- Singapore National Research Foundation (NRF) under the Competitive Research Programs (CRP Grant) [NRF-CRP15-2015-01]
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Despite several attempts, the intimate electronic structure of two-dimensional electron systems buried at the interface between LaAlO3 and SrTiO3 still remains to be experimentally revealed. Here, we investigate the transport properties of a high-mobility quasi-two-dimensional electron gas at this interface under high magnetic field (55 T) and provide new insights for electronic band structure by analyzing the Shubnikov-de Haas oscillations. Interestingly, the quantum oscillations are not 1/B-periodic and produce a highly non-linear Landau plot (Landau level index versus 1/B). We explore different scenarios leading to 1/B-aperiodic oscillations where the charge and the chemical potential vary as the magnetic field increases. Overall, the magneto-transport data are discussed in light of high-resolution scanning transmission electron microscopy (HRSTEM) analysis of the interface as well as calculations from density functional theory.
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