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Electron Trapping Mechanism in LaAlO₃/SrTiO₃ Heterostructures

Yin, C; Smink, AEM; Leermakers, I; Tang, LMK; Lebedev, N; Zeitler, U; Van der Wiel, WG; ... Aarts, J; + view all (2020) Electron Trapping Mechanism in LaAlO₃/SrTiO₃ Heterostructures. Physical Review Leters , 124 (1) , Article 017702. 10.1103/PhysRevLett.124.017702. Green open access

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Abstract

In LaAlO_{3}/SrTiO_{3} heterostructures, a still poorly understood phenomenon is that of electron trapping in back-gating experiments. Here, by combining magnetotransport measurements and self-consistent Schrödinger-Poisson calculations, we obtain an empirical relation between the amount of trapped electrons and the gate voltage. The amount of trapped electrons decays exponentially away from the interface. However, contrary to earlier observations, we find that the Fermi level remains well within the quantum well. The enhanced trapping of electrons induced by the gate voltage can therefore not be explained by a thermal escape mechanism. Further gate sweeping experiments strengthen that conclusion. We propose a new mechanism which involves the electromigration and clustering of oxygen vacancies in SrTiO_{3} and argue that such electron trapping is a universal phenomenon in SrTiO_{3}-based two-dimensional electron systems.

Type: Article
Title: Electron Trapping Mechanism in LaAlO₃/SrTiO₃ Heterostructures
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.124.017702
Publisher version: https://doi.org/10.1103/PhysRevLett.124.017702
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10093703
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