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Title: Aperiodic quantum oscillations in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface
Authors: Rubi, Km 
Gosteau, Julien
Serra, Raphael
Han, Kun 
Zeng, Shengwei 
Huang, Zhen 
Warot-Fonrose, Benedicte
Arras, Remi
Snoeck, Etienne
Goiran, Michel
Escoffier, Walter
Issue Date: 30-Jan-2020
Publisher: Nature Research
Citation: Rubi, Km, Gosteau, Julien, Serra, Raphael, Han, Kun, Zeng, Shengwei, Huang, Zhen, Warot-Fonrose, Benedicte, Arras, Remi, Snoeck, Etienne, Ariando, Goiran, Michel, Escoffier, Walter (2020-01-30). Aperiodic quantum oscillations in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface. NPJ QUANTUM MATERIALS 5 (1). ScholarBank@NUS Repository.
Abstract: 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. © 2020, The Author(s).
ISSN: 23974648
DOI: 10.1038/s41535-020-0210-z
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