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Tunable interface states driven by ferroelectric polarization discontinuity in BiFeO₃-based superlattice

Zhang, Sa; Yang, Baishun; Liu, Zijiang; Zu, Xiaotao; Scanlon, David O; Huang, Bing; Qiao, Liang; (2022) Tunable interface states driven by ferroelectric polarization discontinuity in BiFeO₃-based superlattice. Applied Physics Letters , 121 (22) , Article 221601. 10.1063/5.0098699. Green open access

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Abstract

Interfacial electronic reconstruction is one of the central topics in condensed matter research as it brings in new physics and novel material properties. Typically, it is induced by dipole, valence, or lattice discontinuities near the interfaces. However, ferroelectric polarization discontinuity (FPD) can also induce electronic reconstruction, which is not well understood, particularly in perovskite oxide interfaces. Here, we demonstrate that FPD plays critical roles in determining the electronic properties of ferroelectric superlattices and creates coexisted two-dimensional hole gas (2DHG) and two-dimensional electron gas (2DEG). We further unravel that FPD competes the traditional polar discontinuity, thus, can lead to various final interface states. The present work opens a special door to achieve 2DEG and 2DHG in the ferroelectric perovskite heterostructure via ferroelectric polarization discontinuity and provides a guidance to achieve emergent interfacial phenomena.

Type: Article
Title: Tunable interface states driven by ferroelectric polarization discontinuity in BiFeO₃-based superlattice
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/5.0098699
Publisher version: https://doi.org/10.1063/5.0098699
Language: English
Keywords: Nonlinear geophysics, Two-dimensional electron gas, Heterostructures, Superlattices, Dielectric materials, Ferroelectricity, Interfacial properties, Electromagnetism, Interfaces, Perovskites
UCL classification: UCL
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 Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10161383
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