Mapping Band Alignment across Complex Oxide Heterointerfaces

Huang, Bo; Chiu, Ya-Ping; Huang, Peter; Wang, Wen-Ching; Tra, Vu Thanh; Yang, Jinn‐Chuang; He, Qing; Lin, Jiunn Yuan; Chang, Chia Seng; Chu, Ying Hao

doi:10.1103/physrevlett.109.246807

Cited by 69 publications

(53 citation statements)

References 34 publications

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“…Similar findings have been reported for LAO/STO heterostructures [23,29,30,43]. Different scenarios have been introduced to account for these observations, of which photoinduced carriers, oxygen vacancies, and antisite defects will be discussed in the following.…”

Section: Discussionsupporting

confidence: 76%

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

et al. 2015

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Section: Discussionsupporting

confidence: 76%

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

et al. 2015

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“…As seen in other published studies [20][21][22] , there is a suppression of T c in the SLs (compared with the bulk value of B91 K). A crosssectional view of the interfaces was created by fracturing the samples in situ in the ultrahigh vacuum (UHV) chamber prior to the XSTM/S measurements 18,[23][24][25][26][27][28][29] . Figure 1b shows a schematic of the geometry of the XSTM measurements in this study.…”

Section: Resultsmentioning

confidence: 99%

Visualizing short-range charge transfer at the interfaces between ferromagnetic and superconducting oxides

et al. 2013

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The interplay between antagonistic superconductivity and ferromagnetism has been a interesting playground to explore the interaction between competing ground states. Although this effect in systems of conventional superconductors is better understood, the framework of the proximity effect at complex-oxide-based superconductor/ferromagnet interfaces is not so clear. The main difficulty originates from the lack of experimental tools capable of probing the interfaces directly with high spatial resolution. Here we harness cross-sectional scanning tunnelling microscopy and spectroscopy together with atomic-resolution electron microscopy to understand the buried interfaces between cuprate and manganite layers. The results show that the fundamental length scale of the electronic evolution between YBa 2 Cu 3 O 7 À d (YBCO) and La 2/3 Ca 1/3 MnO 3 (LCMO) is confined to the subnanometre range. Our findings provide a complete and direct microscopic picture of the electronic transition across the YBCO/LCMO interfaces, which is an important step towards understanding the competition between ferromagnetism and superconductivity in complex-oxide heterostructures.

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“…Such scenario has been convincingly invoked to explain conductivity in SrTiO 3 single crystals covered by an amorphous overlayer16. This hypothesis, suggesting a complete breakdown of the electronic reconstruction scenario, is anyway at odds with a number of experiments that confirmed the presence of a strong electric polarization of the LaAlO 3 lattice36, and directly measuring the presence of an electrical potential gradient in the LaAlO 3 layer4950, although smaller than predicted121314.…”

Section: Discussionmentioning

confidence: 98%

Universal electronic structure of polar oxide hetero-interfaces

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Heming

Knupfer

et al. 2015

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The electronic properties of NdGaO3/SrTiO3, LaGaO3/SrTiO3, and LaAlO3/SrTiO3 interfaces, all showing an insulator-to-metal transition as a function of the overlayer-thickness, are addressed in a comparative study based on x-ray absorption, x-ray photoemission and resonant photoemission spectroscopy. The nature of the charge carriers, their concentration and spatial distribution as well as the interface band alignments and the overall interface band diagrams are studied and quantitatively evaluated. The behavior of the three analyzed heterostructures is found to be remarkably similar. The valence band edge of all the three overlayers aligns to that of bulk SrTiO3. The near-interface SrTiO3 layer is affected, at increasing overlayer thickness, by the building-up of a confining potential. This potential bends both the valence and the conduction band downwards. The latter one crossing the Fermi energy in the proximity of the interface and determines the formation of an interfacial band offset growing as a function of thickness. Quite remarkably, but in agreement with previous reports for LaAlO3/SrTiO3, no electric field is detected inside any of the polar overlayers. The essential phenomenology emerging from our findings is discussed on the base of different alternative scenarios regarding the origin of interface carriers and their interaction with an intense photon beam.

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Mapping Band Alignment across Complex Oxide Heterointerfaces

Cited by 69 publications

References 34 publications

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

Band bending and alignment at the spinel/perovskiteγ−Al2O3/SrTiO3heterointerface

Visualizing short-range charge transfer at the interfaces between ferromagnetic and superconducting oxides

Universal electronic structure of polar oxide hetero-interfaces

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