Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations

Jang, Ho Won; Felker, D. A.; Bark, Chung Wung; Wang, Y.; Niranjan, Manish K.; Nelson, C.T.; Zhang, Y.; Su, Dong; Folkman, C. M.; Baek, Seung Hyub; Lee, Sanghan; Janicka, Karolina; Zhu, Ye; Pan, Xiaoqing; Fong, Dillon D.; Tsymbal, Evgeny Y.; Rzchowski, M. S.; Eom, Chang‐Beom

doi:10.1126/science.1198781

Cited by 220 publications

(172 citation statements)

References 34 publications

(54 reference statements)

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“…The computational details have been given elsewhere. 12,44 The effect of strong correlations, which have been shown to be important in STO/RO (R = La, Pr, Nd, Sm) interfaces, 45 are not treated explicitly here. Although their inclusion in terms of LDA + U may modify the electrostatic potential profile slightly, it would not change our main theoretical conclusions, which are dominated by the polarity of the system.…”

Section: Dft Calculationsmentioning

confidence: 99%

Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3oxide heterostructures

et al. 2013

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Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3 oxide heterostructures Slooten, E.; Zhong, Z.; Molegraaf, H.J.A.; Eerkes, P.D.; de Jong, S.; Massee, F.; van Heumen, E.; Kruize, M.K.; Wenderich, S.; Kleibeuker, J.E.; Gorgoi, M.; Hilgenkamp, H.; Brinkman, A.; Huijben, M; Rijnders, G.; Blank, D.H.A.; Koster, G.; Kelly, P.J.; Golden, M.S. Published in:Physical Review B DOI:10.1103/PhysRevB.87.085128 Link to publicationCitation for published version (APA): Slooten, E., Zhong, Z., Molegraaf, H. J. A., Eerkes, P. D., de Jong, S., Massee, F., ... Golden, M. (2013). Hard xray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3 oxide heterostructures. Physical Review B, 87(8), 085128. https://doi.org/10.1103/PhysRevB.87.085128 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A combined experimental and theoretical investigation of the electronic structure of the archetypal oxide heterointerface system LaAlO 3 on SrTiO 3 is presented. High-resolution, hard x-ray photoemission is used to uncover the occupation of Ti 3d states and the relative energetic alignment-and hence internal electric fields-within the LaAlO 3 layer. First, the Ti 2p core-level spectra clearly show occupation of Ti 3d states already for two unit cells of LaAlO 3 . Second, the LaAlO 3 core levels were seen to shift to lower binding energy as the LaAlO 3 overlayer thickness, n, was increased, agreeing with the expectations from the canonical electron transfer model for the emergence of conductivity at the interface. However, not only is the energy offset of only ∼300 meV between n = 2 (insulating interface) and n = 6 (metallic interface) an order of magnitude smaller than the simple expectation, but it is also clearly not the sum of a series of unit-cell-by-unit-cell shifts within the LaAlO 3 block. Both of these facts argue against the simple charge-transfer picture involving a cumulative shift of the LaAlO 3 valence bands above the SrTiO 3 conduction bands, resulting in charge transfer only for n 4. We discuss effects which could frustrate this elegant and simple charge-transfer model, concluding that although it cannot be ruled out, photodoping by the x-ray beam is unlikely to be the cause of the o...

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Section: Dft Calculationsmentioning

confidence: 99%

Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3oxide heterostructures

et al. 2013

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“…Because LaAlO 3 consists of atomic planes of alternating charge, charge is transferred to the interface to eliminate the internal electric field, leading to a 2DEG above a certain critical thickness of LaAlO 3 [8,9]. Tunable metallic properties of this interface are promising for potential applications [10][11][12][13][14]. In addition, magnetism [15] and superconductivity [16] have been discovered at this interface, suggesting further implications for nanoelectronics [6].…”

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Highly Spin-Polarized Conducting State at the Interface between Nonmagnetic Band Insulators:LaAlO3/FeS2(001)

Burton

Tsymbal

2011

Phys. Rev. Lett.

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First-principles density functional calculations demonstrate that a spin-polarized two-dimensional conducting state can be realized at the interface between two non-magnetic band insulators. The (001) surface of the diamagnetic insulator FeS 2 (pyrite) supports a localized surface state deriving from Fe dorbitals near the conduction band minimum. The deposition of a few unit cells of the polar perovskite oxide LaAlO 3 leads to electron transfer into these surface bands, thereby creating a conducting interface. The occupation of these narrow bands leads to an exchange splitting between the spin sub-bands, yielding a highly spin-polarized conducting state distinct from the rest of the non-magnetic, insulating bulk. Such an interface presents intriguing possibilities for spintronics applications.

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“…[1][2][3][4][5][6][7] Due to recent advances in atomic level synthesis technique, interface engineering [8][9][10][11][12][13] of oxides has emerged as a useful approach to explore and fine tune their functional properties. Because manipulating the interface is often associated with the added structural distortions, it is crucial to understand how the interfacial modification affects not only the structural but also the physical properties of entire constituent oxide layers.…”

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Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

et al. 2015

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Interface engineering of structural distortions is a key for exploring the functional properties of oxide heterostructures and superlattices. In this paper, we report on our comprehensive investigations of oxygen octahedral distortions at the heterointerface between perovskite oxides SrRuO3 and BaTiO3 on GdScO3 substrates and of the influences of the interfacially engineered distortions on the magneto-transport properties of the SrRuO3 layer. Our state-of-the-art annular bright-field imaging in aberration-corrected scanning transmission electron microscopy revealed that the RuO6 octahedral distortions in the SrRuO3 layer have strong dependence on the stacking order of the SrRuO3 and BaTiO3 layers on the substrate. This can be attributed to the difference in the interfacial octahedral connections. We also found that the stacking order of the oxide layers has a strong impact on the magneto-transport properties, allowing for control of the magnetic anisotropy of the SrRuO3 layer through interface engineering. Our results demonstrate the significance of the interface engineering of the octahedral distortions on the structural and physical properties of perovskite oxides.

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Metallic and Insulating Oxide Interfaces Controlled by Electronic Correlations

Cited by 220 publications

References 34 publications

Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3oxide heterostructures

Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO3/LaAlO3oxide heterostructures

Highly Spin-Polarized Conducting State at the Interface between Nonmagnetic Band Insulators:LaAlO3/FeS2(001)

Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

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