Direct imaging of the electron liquid at oxide interfaces

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Title
Direct imaging of the electron liquid at oxide interfaces
Author(s)
Kyung Song; Sangwoo Ryu; Hyungwoo Lee; Tula R. Paudel; Christoph T. Koch; Bumsu Park; Ja Kyung Lee; Si-Young Choi; Young-Min Kim; Jong Chan Kim; Hu Young Jeong; Mark S. Rzchowski; Evgeny Y. Tsymbal; Chang-Beom Eom; Sang Ho Oh
Publication Date
2018-03
Journal
Nature Nanotechnology, v.13, no.3, pp.198 - 203
Publisher
NATURE PUBLISHING GROUP
Abstract
The breaking of symmetry across an oxide heterostructure causes the electronic orbitals to be reconstructed at the interface into energy states that are different from their bulk counterparts(1). The detailed nature of the orbital reconstruction critically affects the spatial confinement and the physical properties of the electrons occupying the interfacial orbitals(2-4). Using an example of two-dimensional electron liquids forming at LaAlO3/SrTiO3 interfaces(5,6) with different crystal symmetry, we show that the selective orbital occupation and spatial quantum confinement of electrons can be resolved with subnanometre resolution using inline electron holography. For the standard (001) interface, the charge density map obtained by inline electron holography shows that the two-dimensional electron liquid is confined to the interface with narrow spatial extension (similar to 1.0 +/- 0.3 nm in the half width). On the other hand, the two-dimensional electron liquid formed at the (111) interface shows a much broader spatial extension (similar to 3.3 +/- 0.3 nm) with the maximum density located similar to 2.4 nm away from the interface, in excellent agreement with density functional theory calculations © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/4637
ISSN
1748-3387
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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