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Aperiodic quantum oscillations in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface

Abstract : Despite several attempts, the intimate electronic structure of two-dimensional electron systems buried at the interface between LaAlO 3 and SrTiO 3 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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Contributor : Rémi Arras <>
Submitted on : Friday, November 20, 2020 - 2:42:23 PM
Last modification on : Friday, March 26, 2021 - 9:54:04 PM

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Km Rubi, Julien Gosteau, Raphaël Serra, Kun Han, Shengwei Zeng, et al.. Aperiodic quantum oscillations in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface. Npj Quantum Materials, Nature publishing, 2020, 5, pp.9. ⟨10.1038/s41535-020-0210-z⟩. ⟨hal-02988958⟩

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